Question

A student simplified the expression 2-cos²θ to 1-sin²θ . What error did the student make? What is the correct simplified expression?

Answer 1

Answer: 1+sinθ^2

Explanation:

`2-cos^(2)`θ

= 2-(1-sinθ^2)

=2-1+sinθ^2

=1+sinθ^2