Math, asked by jeffrinveroni, 6 months ago

find the value of Cos A + Cos(120+A) + Cos(120-A)

Answers

Answered by hardhik2111

1

Answer:

0

Step-by-step explanation:

We know that cos(A+B)+cos(A-B)=2cosAcosB

so,

cosA+2cos120cosA

cosA+2cosa x -1/2 (cos120=cos(90+30)=-1/2)

=cosA-cosA

=0

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Answered by ummehani5291

0

Answer:

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