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" If "f:R rarr R" is defined by "f(x)=(1...

" If "f:R rarr R" is defined by "f(x)=(1-x^(2))/(1+x^(2))," then show that "f(tan theta)=cos2 theta

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If f(x)=(1-x^(2))/(1+x^(2)) then show that f(tan theta)=cos2 theta

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