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Question

If y=a−bsinxb+asinx, then (b+asinx)2y1=

A
(a2+b2)sinx
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B
(a2+b2)sinx
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C
(a2+b2)cosx
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D
(a2+b2)cosx
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Solution

The correct option is D (a2+b2)cosx
y=absinxb+asinx
y1=(b+asinx)(bcosx)(absinx)(acosx)(b+asinx)2
(b+asinx)2y1=b2cosxabsinxcosxa2cosx+absincosx
(b+asinx)2y1=(a2+b2)cosx

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