Math, asked by sonukumar80, 1 year ago

Prove that cosx+cos(120-x) +(120+x)=0
L.H.S=cosx+cos(120-x) +(120+x)
=cosx+2cos120.cos5x {चुकि =cos(A+B)=cos(A-B) =-2sinA.sinB}
=cosx+(-2cos(180-60)cosx
=cos-2.1/2.cosx
=cosx-cosx
=0 R.H.S proved

Answers

Answered by jashansidhubti
2
u have already done
what r u asking

sonukumar80: thanks
jashansidhubti: why thanks
Answered by dhruv1605
1
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it's all ready done bro
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