Step-by-step explanation:
Given: 
As the domain for the inverse sine function is 1 ≤ x ≤ 1 as this is the range for the sine function.
The range for the function is the same as the range for the cosine function, 1 ≤ y ≤ 1
As

So, using the identity 

As the sin and inverse sin function do cancel each other, so only x² is left.
Hence,
; 
<em>Keywords: trigonometric function </em>
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Step-by-step explanation:
15a)
Subtract both sides by 21

15b)
7 and -3 multiply to -21 and add to 4
The factors are (x+7)(x-3)
15c)
x+7 =0
x=-7
x-3=0
x=3
Maybe she can get 2 or4 or1. those ar all the possible answers
Answer:
Step-by-step explanation:
If you cut the square apart along a diagonal, you'll then have two isosceles triangles. Each such triangle will have 3 sides and 3 angles.
Next time, please type in a more descriptive title for your question.
Answer:
12$
Step-by-step explanation:
20 - 8 = $12