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CBSE Class 12 Math 2019 Delhi Set 1 Solved Paper

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Question : 16
Total: 29
If log(x2+y2)=2tan−1(‌
y
x
), show that ‌
dy
dx
=‌
x+y
x−y
.
OR
If xy−yx=ab, find ‌
dy
dx
.
Solution:  
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