Which one of the following is true? For the function f(x)= cos x
f is strictly decreasing in `(pi, 2pi)`

Which one of the following is true? For the function f(x)= cos x f is strictly increasing in (pi, 2pi)

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

Is the function f(x) = cos x strictly increasing in (0, pi) ?

Is the function f(x) = 5x - 4 strictly increasing on R ?

Is the function f(x)=cot^(-1) x strictly increasing?

Is the function f(x)= tan^(-1)x strictly increasing?

Show that f (x)= x^2 is strictly decreasing in (-oo,0)

Answer the following questions: Write the interval in which the function f(x)=cos x is strictly decresing.

Which one of the following is true? For the real function, f(x) = {{:(x + 2 ", if" x le 1),(x - 2 ", if" x gt 1):}