Q.
The solution of differential equation e−x(y+1)dy+cos2x−sin2xydx=0 , if y(0)=1,is
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a
y+1+excos2x=2
b
y+logy=excos2x
c
logy+1+excos2x=1
d
y+logy+excos2x=2
answer is D.
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Detailed Solution
Given that e−x(y+1)dy+cos2x−sin2xydx=0⇒y+1ydy=−excos2x−sin2xdx Integrating on both sides ∫1+1ydy=−∫excos2x−sin2xdx⇒y+logy=−excos2x+c…….. 1) ∵∫exf(x)+f′(x)dx=exf(x) As y(0)=11+log(1)=−e0cos20+c⇒y+logy+excos2x=2
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