1.

Cos5A cos6A+sin5A sin6A

Answer»

ANSWER:

Step-by-step explanation:

       its of the form of the formula COS(m-n)

                       using above gives u cos(6A-5A) = COSA

                   and formula is cos m cosn + sinm sin n = cos(m-n)

           REMEMBER this formula

                   hopr u GET it mate.................



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