Question

On the domain of [0,2π), for which of the following values of x will cosx=secx? Choose all answers that apply.

Answer Choices In Pic

Answer 1

`cos(\pi )=-1`

Explanation:

`f(x)=cos(x)`

State that the values where cos x is minimum:

`x=\pi +2\pi n,n`∈ℤ

`cos(0)=1\\cos((\pi)/(4) )=(√(2) )/(2) \\cos((\pi )/(2) )=0\\cos(\pi )=-1\\cos((3\pi )/(2))=0`