How do you find the stationary points of the function $y=cos(x)$ ?

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Answer 1 · 2014-10-30T20:10:15

$y=cosx$

By taking the derivative,

$y'=sinx=0 Rightarrow x=npi$ , where $n$ is any integer

Since $y(npi)=cos(npi)=(-1)^n$ ,

its stationary points are $(npi,(-1)^n)$ for every integer $n$ .

I hope that this was helpful.

How do you find the stationary points of the function y=cos(x)y=cos(x)?