Sun December 25, 2011 By: Mandakranta Chakraborty
  1. 64cos3?sin4? = cos7?-cos5?-3cos3?+3cos?
  2. Prove that:

Expert Reply
Sun December 25, 2011
We would request you to clarify the first question so that we may answer this to the best of the ability. The solution to the second question is as follows:
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