Math, asked by shiraayshe123, 2 months ago

cos (60°+A) +cos (60°-A)

Answers

Answered by ravi2303kumar

1

Answer:

cosA

Step-by-step explanation:

we know, cos(A+B) + cos(A-B) = 2cosAcosB

so, cos (60°+A) +cos (60°-A)

= 2cos60°cosA

= 2*(1/2).cosA

= cosA

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