[" Hofs If "sin A=(1)/(sqrt(5))" and "si...

[" Hofs If "sin A=(1)/(sqrt(5))" and "sin B=(1)/(sqrt(10))" ,find the "],[" values of "cos A" and "cos B" .Hence,using the formula "],[cos(A+B)=cos A cos B-sin A sin B," show that "],[A+B=45^(@).]

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