[" 7.(i) "" If "theta=30^(@)," then veri...

[" 7.(i) "" If "theta=30^(@)," then verify that "sin3 theta=3sin theta-4sin^(3)theta],[" (ii) If "A=60^(@)" and "B=30^(@)" ,verify that "cos(A-B)=cos A cos B+sin A sin B]

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