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

[" 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)," (c) "sin A sin B=-(1)/(5)," (d) "sin A sin B=(1)/(5)]]

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