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[" If "sin A+sin B=C,&cos A+cos B=D," th...

[" If "sin A+sin B=C,&cos A+cos B=D," then "],[sin(A+B)=?],[[" (a) "C," (b) "(CD)/(C^(2)+D^(2))],[" (c) "(C^(2)+D^(2))/(2CD)," (d) "(2CD)/(C^(2)+D^(2))]]

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