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Is the function f:RtoR defined f(x)=cos(...

Is the function `f:RtoR` defined `f(x)=cos(2x+1)` invertible? Give reasons. Can you modify domain and co-domain of f such that f becomes invertible?

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  13. Find period of following functions (if existsI) f(x)=x-[x]+cos(pix)

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