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Q.

If tany=2t1t2and sinx=2t1+t2then dydx=

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a

cosx

b

1

c

tanx

d

0

answer is D.

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Detailed Solution

Given tany=2t1t2,sinx=2t1+t2

Let t=tanθ

tany=2tanθ1tan2θ=tan2θ

tany=tan2θy=tan1(tan2θ)

y=2θ

dydθ=2(a)

sinx=2tanθ1+tan2θ=sin2θ

sinx=sin2θx=sin1(sin2θ)

x=2θ

dxdθ=2(b)

(a)(b)dydx=22=1

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If tany=2t1−t2and sinx=2t1+t2then dydx=