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Cos A +Cos B = 2Cos( A+B/2)Cos (A-B/2) and using A+B+C =180 ,change (A+B/2 )as (180-C/2),then you get 2SinC/2 = 1 .Sir,kuch bhi views ke liye tukka marne ka style bata rahe hai , concept to bataiye.I am jee aspirants,I have solved it in minds with mindly calculation.
Maan with respect practice question ka first ans hi apka galat he compound can be of variable composition. And all paricles of compound need not to be of only one type so ans b
