Question

How do you write `2cos^2 0.5-1` as a single trigonometric function?

Answer 1

`2cos^2theta-1=cos2theta rArr 2cos^20.5-1=cos(2(0.5))=cos1`.

Explanation:

`2cos^2theta-1=cos2theta rArr 2cos^20.5-1=cos(2(0.5))=cos1`.