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If f:(-pi//2,pi//2)->R and g:[-1,\ 1]->R...

If `f:(-pi//2,pi//2)->R` and `g:[-1,\ 1]->R` be defined as `f(x)=tanx` and `g(x)=sqrt(1-x^2)` respectively. Describe `fog` and `gof` .

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