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CBSE Class 12 Math 2019 Delhi Set 1 Solved Paper

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Question : 16 of 29
Marks: +1, -0
If log⁡(x2+y2)=2tan⁡−1(yx)\log (x^2+y^2) = 2 \tan^{-1} \left( \frac{y}{x} \right), show that dydx=x+yx−y\frac{dy}{dx} = \frac{x+y}{x-y}.
OR
If xy−yx=abx^y - y^x = a^b, find dydx\frac{dy}{dx}.
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