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Correct answer is 48 square feet.

D. 0

General Formulas and Concepts:

Algebra I

Function Notation

Pre-Calculus

Unit Circle

Calculus

DerivativesDerivative NotationDerivative of csc(x) = -csc(x)cot(x)

Step-by-step explanation:

Step 1: Define

f(x) = csc(x)

f'(π/2) is x = π/2

Step 2: Differentiate

Differentiate:                    f'(x) = -csc(x)cot(x)

Step 3: Evaluate

Substitute in x:                    f'(π/2) = -csc(π/2)cot(π/2)Evaluate:                              f'(π/2) = 0