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Q.

If TanA=xSinB1-xCosB and TanB=ySinA1-yCosAthen SinASinB=

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a

yx

b

xy

c

x-y

d

x+y

answer is A.

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Detailed Solution

tan A=x sin B1-x cos B sin Acos A=x sin B1-x cos B sin A-x sin A cos B=x cos A sin B sin A=x(sin A cos B+cos A sin B) sin A=x sin (A+B) tan B=y sin A1-y cos A sin B=y sin (A+B) sin Asin B=xy

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