- #1

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## Homework Statement

## Homework Equations

Minimum/Maximum occurs when the first derivative=0

## The Attempt at a Solution

$$y=\sin{x}+\cos{x}~\rightarrow~y'=\cos{x}-\sin{x}$$

$$y'=0:~\rightarrow~\cos{x}=\sin{x}~\rightarrow~x=\frac{\pi}{4}+n\cdot \pi$$

It's not correct