- #1

keishaap

- 13

- 0

## Homework Statement

Which is equivalent to: cos(∏/2 + x) - cos(∏/2 - x)?

A) -2cos(x)

B) -2

C) 0

D)-2sin(x)

## Homework Equations

Cos (A-B)

## The Attempt at a Solution

I am totally stuck :( please help!