Math, asked by SharmishthaJadhav, 1 month ago

cosA + cos(120+A) + cos(120 + A)

Answers

Answered by susivijaya84

1

Step-by-step explanation:

CosA+cod(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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