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Q.

If y=x tanx2 then 1+cos x dydx-sin x=

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a

y

b

xy

c

0

d

x

answer is D.

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Detailed Solution

y=x tanx2 dydx=x sec2x2 12+tan x2(1)                         =x+2sin x2 cos x22 cos2 x2 (1+cos x) dydx=x+sin x (1+cos x) dydx-sin x=x

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