What is the square of sin

What is the square of sin

The square of sin is 45 degrees
=(radical 2 / 2) & sup2;
=1/2

How to deal with the square of sin
The square of Tan and the square of COS

(sinx)^2=(1-cos(2x))/2
(cosx)^2=(1+cos(2x))/2
(tanx)^2=(1-cos(2x))/(1+cos(2x))

It is known that the lengths of the two sides of a right triangle are 20cm and 40cm respectively, and the length of the third side is calculated

40 is a right angle side
Then the other side is √ (20 & # 178; + 40 & # 178;) = 20 √ 5cm
40 is a hypotenuse
Yes √ (40 & # 178; - 20 & # 178;) = 20 √ 3cm

The first row is, 1,3,5,2,4, the second row, 4,8,7,6, the third row, the fourth row, what should the fifth row be

The fifth row: 55, the fourth row: 27, 28, the third row: 12, 15, 13, the second row: 4, 8, 7, 6, the first row: 1, 3, 5, 2, 4, respectively

Can the product of three consecutive natural numbers be divisible by 3

One of three consecutive natural numbers must be divisible by 3, so their product can also be divisible by 3
In particular, the following three numbers 0,1,2, because 0 can be divisible by any number, so the product can also be divisible by 3

56 degrees 53 - 28 degrees 57 =?

1 degree = 60 minutes
53 points - 57 points can not be reduced completely, borrow 1 degree: 53 points + 60 points = 113 points, borrow 1 degree, the remaining 55 degrees
55 degrees 113 - 28 degrees 57 = 27 degrees 56

Read and write the letters in the right place

Read the letters and write them in the right place

Given the set a = {x | x2-3x-10 ≤ 0}, B = {x | m + 1 ≤ x ≤ 2m-1}, if a ∪ B = a, find the value range of real number M

∫ a ∪ B = a, ∪ B ⊆ A & nbsp; and a = {- 2 ≤ x ≤ 5}. When B = ∞, m ＜ 2 is obtained from M + 1 ＞ 2m-1, and 2 ≤ m ≤ 3 is obtained from M + 1 ≤ 2m − 1 − 2 ≤ m + 12m − 1 ≤ 5. In conclusion, the value range of real number m is (- ∞, 3]

In the first semester of the first semester of junior high school, the equation of one variable is solved, and the simplified evaluation is attached with 15 overall answers

A = 2, B = 4, find 2 (a-b-54) + 3 (a + b) = 5A + b-108 = 5 * 2 + 4-108 = - 94, a = b = 1, find a + B-2 (a-b + 1) = - A + 3b-2 = - 1 + 3-2 = 0. By the way, I'll give you a formula: a = x, B = y, u (a + B-P) + V (a-b + Q) = (U + V) x + (U-V) y

On the Mathematical Olympiad of average number
There are 26 boys and 20 girls in class 61. In a math test, the average score of girls is 92. The average score of boys is 1.2 points higher than that of the whole class. What is the average score of the whole class?
Speed 1 minute to play out, the first praise!!!!!!!!!!!!!

Add the score of boys higher than the average score to girls,
Then the average score of the girls becomes the average score of the class
(92 × 20 + 26 × 1.2) △ 20 = 93.56 (points)