NEED ASAP! Write sqrt 25-x^2. as a trigonometric expression by making the substitution

Question

x= 5sinθ where π/2 < θ < 3π/2

simplify as much as possible.

Answer 1

√25 - x² = √25 - 25sin²θ = 5√cos²θ = 5IcosθI = - 5cosθ because for π/2 < θ < 3π/2 cosθ < 0