1.

यदि ` f(x) = (2x)/(1+x^(2))`, तो साबित कीजिए कि `f(tan theta) = sin 2 theta`.

Answer» `f(x) = (2x)/(1+x^(2))`
` :. F(tan theta) = (2 tan theta)/(1+tan^(2) theta) = sin 2 theta`


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