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Q.

Ify=asinx+bcosx,theny2+dydx2isa

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a

function of x

b

function of y

c

function of x and y

d

constant

answer is D.

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Detailed Solution

y=asinx+bcosxDifferentiatingwithrespercttox,wegetdydx=acosx-bsinxNow,dydx2=a cos x-b sin x2=a2cos2x+b2sin2x-2ab sin x cos xandy2=a sin x+b cos x2=a2sin2x+b2cos2x+2ab sin x cos xSo,dydx2+y2=a2sin2x+cos2x+b2sin2x+cos2x=a2+b2=constant

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