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Let f(x)=tanx a n d g(f(x))=f(x-pi/4),...

Let `f(x)=tanx a n d g(f(x))=f(x-pi/4),` where `f(x)a n dg(x)` are real valued functions. Prove that `f(g(x))="tan` `((x-1)/(x+1))dot`

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`g(f(x))="tan"(x-(pi)/(4))=(tanx-1)/(tanx+1)`
or ` g(x)=(x-1)/(x+1) " or " f(g(x))="tan"((x-1)/(x+1))`
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