Answer:
[tex]cos(\pi )=-1[/tex]
Step-by-step explanation:
[tex]f(x)=cos(x)[/tex]
State that the values where cos x is minimum:
[tex]x=\pi +2\pi n,n[/tex]∈ℤ
[tex]cos(0)=1\\cos(\frac{\pi}{4} )=\frac{\sqrt{2} }{2} \\cos(\frac{\pi }{2} )=0\\cos(\pi )=-1\\cos(\frac{3\pi }{2})=0[/tex]
