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19.cos A+cos(120^(@)-A)+cos(120^(@)+Delt...

19.cos A+cos(120^(@)-A)+cos(120^(@)+Delta)=0

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cos120^(@)=

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

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

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 .

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

Prove the following : cos A + cos (120^@ - A) + cos (120^@+ A) = 0 .

Prove that (i) sin A+sin (120^(@)+A)+sin(240^(@)+A)=0 (ii) cos A+cos (120^(@)+A)+cos (120^(@)-A)=0

cos (120^(@)) is -

" cos x + cos " (120^(@) -x ) + " cos "(120^(@) +x)=0

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