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Domain of cosine function

What is the domain of the cosine function f(x)=3cosxf(x)=3\cos x ?

What is the domain of the cosine function h(x)=5cosxh(x)=5\cos x ?

What is the domain of the cosine function f(x)=cos2xf(x)=\cos2x ?

What is the domain of the cosine function g(x)=9cosxg(x)=9\cos x ?

Is the sentence true or false?

The domain of the cosine function f(x)=3cosxf(x)=3\cos x  is  integer Numbers.   

What is the domain of the cosine function f(x)=cos3xf(x)=\cos3x ?

What is the domain of the cosine function f(x)=cosxf(x)=\cos x ?

What is the domain of the cosine function f(x)=2Cosxf(x)=2Cosx ?

What is the domain of the cosine function f(x)=2cosxf(x)=2\cos x ?

What is the domain of the cosine function f(x)=xf(x)=x ?