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[" 28.If "A=30^(@)" and "B=60^(@)" ,veri...

[" 28.If "A=30^(@)" and "B=60^(@)" ,verify that "],[[" (i) ",sin(A+B)=sin A cos B+cos A sin B],[" (ii) ",cos(A+B)=cos A cos B-sin A sin B]]

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