Derivatives of the Trigonometric Functions: Quiz

Problem 4

y = (1 – cos(x))(1 + cos(x)) – sin²(x) + 1

Answers, problem 4

Simplify
y = (1 – cos²(x) – sin²(x) + 1 = sin²(x) – sin²(x) + 1 = 1, so y′ = 0.

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