Prove that the function `f(x)=cosx` is neither increasing nor decreasing in `(0,\ 2pi)`

Prove that the function f(x)=cos x is neither increasing nor decreasing in (0,2 pi)

f(x) = cos x is neither increasing nor decreasing in (0,2pi)

Prove that the function f(x)=x^2-x+1 is neither increasing nor decreasing on (-1,\ 1) .

Prove that the function f(x)=x^(2)-x+1 is neither increasing nor decreasing on (-1,1)

Show that the function given by f(x)=sinx is neither increasing nor decreasing in (0,pi)

Which one of the following is true? For the function f(x)= cos x f is neither increasing nor decreasing in (pi, 2pi)

Show that the function given by f(x) = sinx is neither increasing nor decreasing in (0, pi) .

Prove that the function given by f(x) = cos x is (c) neither increasing nor decreasing in (0 , 2pi) .

Prove that the function x^2 + x+1 is neither increasing nor decreasing on (-1,0)

Show that the function x^2-x+1 is neither increasing nor decreasing on (0,\ 1) .