Math, asked by jeffrinveroni, 9 months ago

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

Answers

Answered by sandy1816

2

Answer:

CosA+cos(120+A)+cos(120-A)

=CosA+2cos120cosA

[cos(A+B)+cos(A-B)=2cosAcosB]

=cosA+2cos(180-60)cosA

=CosA-2cos60cosA

=cosA-2(1/2)cosA

=cosA-cosA

=0

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