Math, asked by KimZ8297, 8 months ago

Cos 3A+Cos 5A+Cos 7A+Cos 9A=4Cos A Cos 2A Cos6A

Answers

Answered by sandy1816

7

Step-by-step explanation:

(cos9A+cos3A)+(cos7A+cos5A)

=2cos6Acos3A+2cos6AcosA

=2cos6A(cos3A+cosA)

=2cos6A(2cos2AcosA)

=4cosAcos2Acos6A

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