If x \frac{d y}{d x}+y=\frac{x f(x y)}{f'(x y)}, then |f(x y)| is equal to

WBJEE 2021 Math Solved Paper

CATEGORY - I (Q:1 to Q50)

Carry 1 mark each and only one option is correct. In case of incorrect answer or any combination of more than one answer, ¼ mark will be deducted.

Question : 3 of 75

Marks: +1, -0

If x

+y=

xf(xy)

f′(xy)

, then |f(xy)| is equal to

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