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Q.

If sin y=x sin(α+y) thendydx=

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a

sin2α+ysinα

b

sinα sin2(α+y)

c

sin2α-ysinα

d

sinαsin2α+y

answer is B.

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Detailed Solution

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Given siny =xsin(α+y) x=sinysinα+y differentiate w.r.to y on both sides dxdy=sinα+ycos y-sin y cosα+ysin2α+y               =sinα+y-ysin2α+y              =sinαsin2α+y

dydx=sin2α+ysinα.

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