1.

Which of the following functions have the same period ?

Answer»

`f(x)=SIN^(2)(x) +COS^(4)x+2`
`g(x)=(1)/(f(sin x))+(1)/(f(cos x))` where `f(x)=(1)/(sqrt(1-x^(2)))`
`h(x)=(|sin x|+|cos x|)/(|sinx-cosx|)`
`k(x)=cos(cos x)+cos(sin x)`

SOLUTION :ABD
A,B,D each have a period `pi//2`, and C has a period `pi`


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