1).coaat ces sa ăĄ.cste – InterviewSolution

1.

1).coaat ces sa ăĄ.cste

Answer»

cos7A+cos5A = 2cos(7A+5A)/2×cos(7A-5A)/2 = 2cos6AcosA sin7A-sin5A = 2cos(7A+5A)/2×sin(7A-5A)/2 = 2cos(6A)sinA

on diving both 2cos6A gets cancelled, and we get = cosA/sinA = cotA

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