If sin2x and SiNx are the equal difference and equal ratio median of sin θ and cos θ respectively, then the value of cos2x is: () A. 1+338B. 1−338C. 1±338D. 1−24

If sin2x and SiNx are the equal difference and equal ratio median of sin θ and cos θ respectively, then the value of cos2x is: () A. 1+338B. 1−338C. 1±338D. 1−24

According to the meaning of the title, we can know that 2sin2x = sin θ + cos θ sin2x = sin θ cos θ∵ sin2 θ + Cos2 θ = (sin θ + cos θ) 2-2sin θ cos θ = 4sin22x-2sin2x = 1  4 (1-cos22x) + cos2x-2 = 0, that is, 4cos22x-cos2x-2 = 0
What are prime numbers, composite numbers, odd numbers and even numbers in the total of 1-20
Prime numbers 2,3,5,7,11,13,17,19
Total 4,6,8,9,10,12,14,15,16,18,20
Odd 1,3,5,7,9,11,13,15,17,19
Even 2,4,6,8,10,12,14,16,18,20
Prime numbers 2,3,5,7,11,13,17,19
Total 4,6,8,9,10,12,14,15,16,18,20
Odd 1,3,5,7,9,11,13,15,17,19
Even numbers, 2,4,18,16,8
Prime number (that is, its divisor is only 1 and it has two, 1 is not): 2, 3, 5, 7, 11, 13, 17, 19
Composite number (that is, its divisor has other divisors besides 1 and itself): 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20
Odd (integers not divisible by 2): 1, 3, 5, 7, 9, 11, 13, 15, 17, 19
Even numbers (integers divisible by 2): 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, etc
Prime number (that is, its divisor is only 1 and it has two, 1 is not): 2, 3, 5, 7, 11, 13, 17, 19
Composite number (that is, its divisor has other divisors besides 1 and itself): 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20
Odd (integers not divisible by 2): 1, 3, 5, 7, 9, 11, 13, 15, 17, 19
Even numbers (integers divisible by 2): 2, 4, 6, 8, 10, 12, 14, 16, 18, 20
Prime number: refers to the number 2, 3, 5, 7, 11, 13, 17, 19 that cannot be divisible by other natural numbers except 1 and the integer itself in a natural number greater than 1
Total number: 4,6,8,9,10,12,14,15,16,18,20
1 is neither prime nor composite
Odd numbers: 1,3,5,7,9,11,13,15,17,19, the rest are even numbers
Integral (0,1) [SiNx xcosx] / [cosx + xsinx]
If the title, ideas are OK~
There are odd numbers in 1-20______ Even numbers have______ The prime number is______ The total number is______ It is not only a combined number but also an odd number______ It is not only a combined number but also an even number______ It is neither prime nor composite______ .
In 1-20, odd numbers are: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19; even numbers are: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20; prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19; combined numbers are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20; both combined and odd numbers are: 9
Let f (x) = xsinx (x belongs to Z)
(1) It is proved that f (x + 2K) - f (x) = 2K SiNx, K belongs to Z;
(2) Let x = x0 be an extreme point of F (x), and prove that: [f (x0)] ^ 2 = (x0) ^ 4 / (1 + (x0) ^ 2)
R x belongs to the front
F (x) = x * sinxf (x + 2K π) - f (x) = (x + 2K π) sin (x + 2K π) - xsinx = (x + 2K π) SiNx xsinx = 2K π * SiNx is proved. 2. F (x) = xsinxf '(x) = SiNx + xcosx according to the meaning x = x0 is an extreme point of F (x), then f' (x0) = 0; so: sinx0 + x0 * cosx0 = 0x0 * cosx0 = - sinx0
What are the prime numbers, total numbers, odd numbers and even numbers of 100?
Prime: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97 total: 4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39,40,42,44,45,46,48,49,50,51,52,54,55,56,57,58
Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
Total number: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58
Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
Total number: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94 ，95，96，98，99，100
Odd numbers: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99
Even numbers: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98100
What are the total numbers of 4
Prime numbers from 1 to 100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Prime numbers, 31, 49, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27
The rest is sum
Odd numbers 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71... Expand
Prime numbers 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 69, 71, 73, 79, 83, 89, 91, 97
The rest is sum
Odd numbers 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99
The rest are even numbers
All integer sets = {0,1} + prime Set + composite set = odd set + even set
The prime number is 1 ~ 100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
The sum of 2 1 ~ 100 is
4 6 8 9 10 12 14 15 16 20 21 22 24 26 27 28 30 32 3... Unfold
All integer sets = {0,1} + prime Set + composite set = odd set + even set
The prime number is 1 ~ 100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
The sum of 2 1 ~ 100 is
4 6 8 9 10 12 14 15 16 18 20 21 22 24 25 26 27 28 30 32 33 34 35 36 38 39 40 42 44 45 46 48 49 50 51 52 54 55 56 57 58 60 62 63 64 65 66 68 69 70 72 74 75 76 77 78 80 81 82 84 85 86 88 90 92 94 95 96 98 99
The odd numbers of 3 1 ~ 100 have
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99
Even numbers from 4 1 to 100 have
2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98100
Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
Total number: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58
Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
62, 72, 45, 85, 45, 45, 85, 86, 26, 60, 86, 86, 26, 45, 80, 86, 86, 26, 60, 86, 86, 26, 45, 45, 86, 86, 86, 45, 45, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 26, 86, 86, 86, 86, 86, 86 ，95，96，98，99，100
Odd numbers: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99
Even numbers: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98100
I'll give you something else
Multiple of two: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98100
Three times: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99
Multiple of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100
Neither prime nor composite: 1
Prime numbers 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,79,83,89,
Ninety-seven
Composite numbers are numbers other than prime numbers and 1,0.
Odd and even numbers should be able to find them by themselves.
Too few points.
Prime number: 23 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97;
Total number: numbers other than the above numbers and 1;
Odd number: 1,3,5,7,9;
Even number: 2,4,6,8,0
Prime: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,91,93,97
Composite number: a number other than prime number and 1;
Odd number: the number of single digits is 1,3,5,7,9;
Even number: the number of single digits is 2,4,6,8,0
Prime numbers 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 69, 71, 73, 79, 83, 89, 91, 97
Odd numbers 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73... Expand
Prime numbers 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 69, 71, 73, 79, 83, 89, 91, 97
Odd numbers 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99
Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
Total: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21