Question

convert cos4A + cos6A into product​

Answer 1

Answer:

cos4A + cos6A = 2 cos 5A cos A is answer

Step-by-step explanation:

cos4A + cos6A is in form of cosC +cosD

the formula for cosC +cosD

cosC +cosD=2cos((C+D)/2) cos((C-D) /2)

cos4A + cos6A= 2cos ((4A+6A)/2)cos((4A-6A)/2)

=2 cos5Acos(-A)

cos4A + cos6A = 2 cos 5A cos A is answer.

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