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Question

If y=x+1x+1x+1x+ then dydx=

A
dydx=x2xy
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B
dydx=y2yx
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C
dydx=2y2xy
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D
None of these
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Solution

The correct option is B dydx=y2yx
We have
y=x+1x+1x+1x+
=x+1y
or y2=xy+1
or 2ydydx=y+xdydx+0 [Differentiating both sides w.r.t. x]
or dydx(2yx)=y
or dydx=y2yx

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