Math, asked by harry3146, 11 months ago

prove that cos3x+cos5x+cos7x+cos15x=4cos4cosx cos5x cos6x

Answers

Answered by piyushpandat

8

just use the formula cos a + cos b=2cos(a+b)/2 cos(a-b)/2

Answered by yashbisht28

32

hope answer is helpful

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