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If x^2+y^2=(t+1/t) and x^4+y^4=t^2+1/t^2...

If `x^2+y^2=(t+1/t)` and `x^4+y^4=t^2+1/t^2`, then `x^3y(dy)/(dx)=`

A

-1

B

-2

C

`y/x`

D

xy

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The correct Answer is:
B
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TARGET PUBLICATION-DIFFERENTIATION -COMPETITIVE THINKING
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