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Q.

y=a cosx+b+2xsinxy''+y=

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a

cosx

b

2cosx

c

3cosx

d

4cosx

answer is D.

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Detailed Solution

y=a cos x+(b+2x)sin x y1=-a sin x+(b+2x)cos x+2sin x y11=-a cos x-(b+2x)sin x+2cos x+2cos x y11=-y+4cos x y11+y=4cos x

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