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To find cos t * cos 2t do u take A as t or 2t in the formula cos A * Cos B = 1/2(cos(a+b) + cos (a-b)) ?

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  • To find cos t * cos 2t do u take A as t or 2t in the formula cos A * Cos B = 1/2(cos(a+b) + cos (a-b)) ?


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