Evaluate cos pi - sin pi/2
-2
-1
0
1

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

In which form is the following function written? y = - 2(x – 3)(x + 5)

Select the correct answer. what is the exact value of sin (157.5°)? a. 'sqrt(2 - sqrt(2))/2 b. *"-"'sqrt(2 + sqrt(2))/29 c.'sqrt(2 + sqrt(2))/4" d. "-"sqrt(2 + sqrt(2))/4)