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## Homework Statement

## Homework Equations

Trig identities or straightforward derivative?

## The Attempt at a Solution

Is the answers

1. C

2. B

3. A

4. D

I tried taking the derivative of these, but a friend of mine here told me it deals with trig identities and isn't a derivative equation at all. Is he wrong ?

I am pretty sure these are the solutions but i want to double check ...