Prove sin3x SiNx cubic + cos3x cosx cubic = cos2x cubic

Prove sin3x SiNx cubic + cos3x cosx cubic = cos2x cubic

Sin ^ 3x is the cubic power of SiN x, sin 3xsin ^ 3x + cos 3xcos ^ 3x = sin 2x cos xsin ^ 3x + cos 2xsin ^ 4x + cos 2xcos ^ 4x-sin 2xsin xcos ^ 3x = 1 / 2 (sin ^ 2 (2x) sin ^ 2x-sin ^ 2 (2x) cos ^ 2x) + cos 2x (sin ^ 4x + cos ^ 4x) = - 1 / 2Sin ^ 2 (2x) cos 2x + cos 2x (sin ^ 4x + cos ^ 4x) = - 1
Trigonometric function 1. Solution x, 2 (cosx) square + 3sinx = 3 2. Prove that (sinx-sin2x + sin3x) / (cosx-cos2x + cos3x) = tan2x
3. Prove sin5x-sin3x + SiNx = o
2 (cosx) square + 3sinx = 3
2 (1-sinx Square) + 3sinx = 3
2sinx square - 3sinx + 1 = 0
sinx=1,sinx=1/2
.
（sinx-sin2x+sin3x）/(cosx-cos2x+cos3x)
=（sinx+sin3x-sin2x）/(cosx+cos3x-cos2x)
=(2sin2xcosx-sin2x)/(2cos2xcosx-cos2x)
=sin2x/cos2x
=tan2x
1. 2 (cosx) square + 3sinx = 3
2(1-sin²x)+3sinx=3
2sin²x-3sinx+1=0
(2sinx-1)(sinx-1)=0
SiNx = 1 / 2 x = 2K π + π / 6 or 2K π + 5 π / 6
Or SiNx = 1, x = 2K π + π / 2
2. (sinx-sin2x + sin3x) / (cosx-cos2x + c... expansion
1. 2 (cosx) square + 3sinx = 3
2(1-sin²x)+3sinx=3
2sin²x-3sinx+1=0
(2sinx-1)(sinx-1)=0
SiNx = 1 / 2 x = 2K π + π / 6 or 2K π + 5 π / 6
Or SiNx = 1, x = 2K π + π / 2
2. （sinx-sin2x+sin3x）/(cosx-cos2x+cos3x)
=(2sin2xcosx-sin2x)/(2cos2xcosx-cos2x)
=sin2x(2cosx-1)/[cos2x(2cosx-1)]
=sin2x/cos2x
=tan2x
Get proof
3. sin5x-sin3x+sinx
=2sin3xcos2x-sin3x
=sin3x(2cos2x-1)
Ontology seems to be wrong, it must not be equal to 0
I hope I can help you. I wish you progress in your study_ ∩ o ∩ put away
The proof of sincos3x / sincoxx
cos3x/sinx+sin3x/cosx=2cot2x
Prove that left is equal to right
Cos3x / SiNx + sin3x / cosx (general)
=(cos3xcosx + sin3xsinx) / (sinxcosx)
=cos(3x-x)/(1/2sin2x)
=2cos2x/sin2x
=2cot2x.
Why cos3x / 2 &; cosx / 2-sin3x / 2 &; SiNx / 2 = cos2x
cos(A+B)=cosAcosB-sinAsinB
Primary school first grade mathematics oral math problems within 100, the more the better, more to add points
58+36= 87-59=
75+27= 68-19=
38+59= 78-49=
67+25= 57-38=
46+46= 64-57=
29+47= 67-59=
16+67= 54-48=
54+46= 71-65=
54+36= 48-39=
49+49= 91-85=
36+14= 25+41= 79-64= 19+21=
11－9＝ 15－6＝ 32－2＝ 50＋1＝
30＋2＝ 16－9＝ 11－4＝ 12－6＝
12－8＝ 12－3＝ 62－2＝ 4＋20＝
13－8＝ 11－2＝ 2＋30＝ 17－9＝
20＋6＝ 14－8＝ 5＋40＝ 15－7＝
15－8＝ 90＋2＝ 12－9＝ 11－5＝
70＋3＝ 5＋30＝ 14－9＝ 13－5＝
80＋4＝ 12－7＝ 3＋30＝ 14－7＝
51－1＝ 17－8＝ 88－8＝ 13－7＝
72－2＝ 60＋3＝ 11－7＝ 1＋90＝
13－9＝ 12－5＝ 3＋60＝ 12－4＝
1＋50＝ 18－9＝ 13－9＝ 90＋2＝
11－8＝ 60＋4＝ 11－3＝ 13－6＝
6＋8 ＝ 81－1＝ 67－7＝ 2＋20＝
15－9＝ 14－5＝ 50＋9＝ 14－6＝
30＋7＝ 9＋80＝ 10＋4＝ 5＋6＝
70＋8＝ 99－9＝ 4＋8 ＝ 39－9＝
9＋6 ＝ 16－8＝ 94－4＝ 8＋40＝
16－7＝ 8＋10＝ 20＋6＝ 60＋7＝
9＋20＝ 11－6＝ 1＋70＝ 15－5＝
3＋8－4 ＝ 68－（ ）＝60 （ ）＋3＝63
66－6＋1＝ 77－（ ）＝70 （ ）－6＝90
12－3＋5＝ 50＋（ ）＝58 （ ）＋50＝52
2＋11＋6＝ 13－（ ）＝7 （ ）－6＝6
59－9＋7＝ 17－（ ）＝9 （ ）－8＝8
35+64 77+12 53+6 81-35 54+12 12-9 62-47 45+54 36-8 74+7 49-44 73-25 55+34 36+48 79-59 80-45 76-21 90-73 45-23 98-89 95-69 78+3 81-7 99-64 66-48 21+54 59-41 98-13 54+31 79-11
I want more rice```
1+1=？
2+2=？
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58 + 36 = 87-59 = thank you, please add some points
75 + 27 = 68-19 = the most, thank you
38+59= 78-49=
67+25= 57-38=
46+46= 64-57=
29+47= 67-59=
16+67= 54-48=
54+46= 71-65=
54+36= 48-39=
49+49= 91-85=
36+14= 25+41= 79-64= 19+21=
There are so many such questions! Go and buy a Book of "mental arithmetic and mental arithmetic" in grade one of primary school!
11－9＝ 15－6＝ 32－2＝ 50＋1＝
30＋2＝ 16－9＝ 11－4＝ 12－6＝
12－8＝ 12－3＝ 62－2＝ 4＋20＝
13－8＝ 11－2＝ 2＋30＝ 17－9＝
20 + 6... Unfold
11－9＝ 15－6＝ 32－2＝ 50＋1＝
30＋2＝ 16－9＝ 11－4＝ 12－6＝
12－8＝ 12－3＝ 62－2＝ 4＋20＝
13－8＝ 11－2＝ 2＋30＝ 17－9＝
20＋6＝ 14－8＝ 5＋40＝ 15－7＝
15－8＝ 90＋2＝ 12－9＝ 11－5＝
70＋3＝ 5＋30＝ 14－9＝ 13－5＝
80＋4＝ 12－7＝ 3＋30＝ 14－7＝
51－1＝ 17－8＝ 88－8＝ 13－7＝
72－2＝ 60＋3＝ 11－7＝ 1＋90＝
13－9＝ 12－5＝ 3＋60＝ 12－4＝
1＋50＝ 18－9＝ 13－9＝ 90＋2＝
11－8＝ 60＋4＝ 11－3＝ 13－6＝
6＋8 ＝ 81－1＝ 67－7＝ 2＋20＝
15－9＝ 14－5＝ 50＋9＝ 14－6＝
30＋7＝ 9＋80＝ 10＋4＝ 5＋6＝
70＋8＝ 99－9＝ 4＋8 ＝ 39－9＝
9＋6 ＝ 16－8＝ 94－4＝ 8＋40＝
16－7＝ 8＋10＝ 20＋6＝ 60＋7＝
9＋20＝ 11－6＝ 1＋70＝ 15－5＝
3＋8－4 ＝ 68－（ ）＝60 （ ）＋3＝63
66－6＋1＝ 77－（ ）＝70 （ ）－6＝90
12－3＋5＝ 50＋（ ）＝58 （ ）＋50＝52
2＋11＋6＝ 13－（ ）＝7 （ ）－6＝6
59-9 + 7 = 17 - () = 9 () - 8 = 8 Stow
53-29= 56+98=
34-12= 59+67=
5-0= 35+0=
13-8= 22+36=
98-42= 44+6=
11－9＝ 15－6＝ 32－2＝ 50＋1＝
30＋2＝ 16－9＝ 11－4＝ 12－6＝
12－8＝ 12－3＝ 62－2＝ 4＋20＝
13－8＝ 11－2＝ 2＋30＝ 17－9＝
20＋6＝ 14－8＝ 5＋40＝ 15－7＝
15－8＝ 90＋2＝ 12－9＝ 11－5＝
70＋3＝ 5＋30＝ 14－9＝ 13－5＝
1. The set of negative and positive numbers is ()
A. A set of rational numbers without fractions and zeros
B. A set of integers without positive numbers and zeros
C. A set of integers removed from a set of integers
D. The set of rational numbers without positive numbers and zeros
2. If - | x | = - 32.5, then the value of X is
A、32.5 B、-32.5
C. + - 32.5 D. none of the above answers is correct
3. The distance between the number axis and the point representing - 2 is 3. The number represented by the point of unit length is______ .
4. If - x = - 8, then the opposite of X is_____ The absolute value of X is_______ .
5. Put the following numbers in the corresponding braces
-Half of 1,6.8,3, 0,0.02, - 4, - 101, - 0.5
fraction:
Integer:
Positive rational number:
Negative rational number:
Non negative number:
Rational number:
6. Calculate the following questions
|-9|+|-6|；
|Four out of seven | - | three out of seven |;
7. Four rational numbers a, B, C and D are known, where a = - {- (+ 3 and half)}, B is the opposite of - | - 4 |, C is 7, and D is the smallest number in the equation | - 3 | = 1
(1) Please work out the four numbers separately?
(2) Connect the four numbers with a greater than sign
(3) Which of the four points on the number axis is farthest from the origin?
1. Negative positive number set refers to the set of (b) a, the set of rational numbers with fractions and zeros removed, the set of integers with positive numbers and zeros removed, the set of integers with positive integers removed, the set of rational numbers with positive numbers and zeros removed
We know that {an} is an arithmetic sequence, and its tolerance is d (D is not 0), and A1, A3 and A7 are the first three terms of the arithmetic sequence {BN},
(1) Find the common ratio Q of the sequence {BN}; (2) which term is b5 in {an}? (3) if A1 = 2, find the limit of the first n terms and Sn of the sequence {1 / BN + 1}. (n + 1 is still in the lower right corner.)
1) According to the meaning of the title, A1 (a1 + 6D) = (a1 + 2D) 2, d = 2A1, d = 0 (rounding off), so q = (a1 + 4A1) / A1 = 52) B5 = 25 (a1 + 6D) = 25a1 + 150D = a1 + 162d = a1 + (163-1) d, so B5 is the 163 item in {an}. 3) if A1 = 2, then B1 = 2, B2 = 10, B3 = 50
Urgently seek four arithmetic problems of grade 6
Four mixed operations
1) （58+370）÷（64-45）
2) 86+(98+14+2)=
3) 255+(352+145+48)=
4) (345+377)+(55+23)=
5) 9+(80+191)=
6) (268+314+132)+86=
7) 5190÷15=
8) 495+(278+5)+222=
9) 174×36×25=
10) 32.52-（6+9.728÷3.2）×2.5
11) (6.8-6.8×0.55)÷8.5
12) 133-(28+29)-43=
13) 1650÷25=
14) 260×8-8-8×59=
15) 0.83×12.5×8
16) 6975÷25=
17) 0.68×1.9+0.32×1.9
18) 328-(163-72)=
19) 199+(84-99)=
20) 885-1-201-298=
21) 460-35-3-262=
22) (98+59+2)+41=
23) 736×12-12-12×335=
24) 116+(112+184)=
25) 150×258+142×150=
26) 31×24×25=
27) 9000÷25=
28) 502-287-54-159=
29) 307+(92+93)=
30) 420+580-64×21÷28
31)（136+64）×（65-345÷23）
32)3.2×（1.5+2.5）÷1.6
33)5.38+7.85-5.37=
34)3.2×（1.5+2.5）÷1.6
35) 544-272-28=
36) 18000÷150÷4=
37) 6-1.19×3-0.43=
38) 25×64×125=
39) 343-188-12=
40) 509×11-11-11×8=
41) 79×24×25=
42) 2.9×102 3.8×6.9+3.8×2.1+3.8
43) 5.4÷[2.6×（3.7-2.9）+0.62]
44) 46+15+54=
45) 589-109-(6+185)=
46) 0.15×（3.79-1.9）+1.11×0.15
47) 10.15-10.75×0.4-5.7
48) 89×245+155×89=
49) 92+(79+8+21)=
50) 2.9×102 3.8×6.9+3.8×2.1+3.8
51) 96×125=
52) 30600÷25÷4=
53) 812-700÷（9+31×11）
54) 85+14×（14+208÷26）
55) （284+16）×（512-8208÷18）
56) 2467×70-70-70×466=
57) 84×25=
58) 120-36×4÷18+35
59) 1616×506+2494×1616=
60) 4×17+4+1982×4=
61) 799×660+340×799=
62) （58+37）÷（64-9×5）
63) (6.8-6.8×0.55)÷8.5
64) 0.12× 4.8÷0.12×4.8
65)（3.2×1.5+2.5）÷1.6
66)6-1.6÷4=
67)7.2÷0.8-1.2×5=
68)6.5×（4.8-1.2×4）=
69)10.15-10.75×0.4-5.7
70)5.8×（3.87-0.13）+4.2×3.74
71)32.52-（6+9.728÷3.2）×2.5
72) 24×1951+24+48×24=
73) 113600÷100÷4=
74) 6.5×（4.8-1.2×4）
75) 1319×1339+1661×1319=
76) 453×8×125=
77) 4928-(871+1928)=
78) （58+370）÷（64-45）
79) 420+580-64×21÷28
80) （136+64）×（65-345÷23）
81) 1526+(938-526)=
82) 803×12×25=
83) 114000÷1200=
84) 3.2×（1.5+2.5）÷1.6
85) 5.38+7.85-5.37=
86) 25×224×125=
87) 95÷（64-45）
88) （58+37）÷（64-9×5
89) 347+45×2-4160÷52
90) 120-144÷18+35
91) 50＋160÷40
92) 101 ＋ 1/5 – 1/5＋ 21
93) 8/7 ＋21/16 + 1/2
94) （284+16）×（512-8208÷18）
95) 12