Question

The period of f(x) = cos ( cosx ) + cos ( sin x ) is

Answer 1

Period is value where function repeats so at x=pi/2 it repeats.1st substitue x=0 u get f(x)=cos1+1 and now substitute x=pi/2 u again get f(x) = cos1+1 therefore pi/2 is period of f(x).