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निम्नलिखित में से प्रत्येक का मान ज्ञात ...

निम्नलिखित में से प्रत्येक का मान ज्ञात कीजिए :
` tan""(1)/(2)[sin^(-1)""(2x)/(1+x^(2))+cos^(-1)""(1-y^(2))/(1+y^(2))],|x| lt 1 , y gt 0` तथा `xy lt 1`

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