Question

Rewrite the sine function f(x)=−2sin(x−π)+3
as a cosine function. In 1–2 sentences, explain how you arrived at your answer.

Use the formula keypad when necessary.

(2 points)

Answer 1

f(x) = 2 cos(x − π/2) + 3.

Explanation: Use -sin θ = cos(θ + π/2). So -2 sin(x − π) = 2 cos((x − π)+π/2) = 2 cos(x − π/2), then add the +3.