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" Prove that "cos A+cos(120^(@)-A)+cos(1...

" Prove that "cos A+cos(120^(@)-A)+cos(120^(@)+A)=0

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cosA+cos(120^(@)-A)+cos(120^(@)+A)=0

cosA+cos(120^(@)-A)+cos(120^(@)+A)=0

cos120^(@)=

Prove that cos(120^(@)+A)+cos(120^(@)-A)=-cosA

Prove that cos(120^(@)+A)+cos(120^(@)-A)=-cosA

Prove that cos(120^@-A)+cosA+cos(120^@+A)=0 .

Prove that cos^3A+cos^3(120^@+A)+cos^3(240^@+A)=3/4cos3A

cos (120^(@)) is -

cos A .cos (120^@ +A ) . Cos (120 ^@ -A ) is

Prove the following: (i) "sin" alpha+"sin"(alpha+(2pi)/(3))+"sin"(alpha+(4pi)/(3))=0 (ii) cos A+cos(120^(@)-A)+cos(120^(@)+A)=0 .