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[" 21.If "cos(A-B)=(3)/(5)" and "tan A t...

[" 21.If "cos(A-B)=(3)/(5)" and "tan A tan B=2" ,then "],[[" (a) "cos A cos B=(1)/(5)," (b) "cos A cos B=-(1)/(5)," FORMULAE "],[" (c) "sin A sin B=-(1)/(5)," (d) "sin A sin B=-(1)/(2),sin A cos alpha]]

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