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Statement I: If x cos theta = y cos (120...

Statement I: If `x cos theta = y cos (120^@ + theta) = z cos ( theta+ 240^@)` then `xy +yz + zx = 1` Statement II: `cos alpha + cos (120^@ + alpha) + cos(120^@– alpha) = 0` Which of the above statements is correct

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I : If x cos theta = y cos (120^@ + theta ) = z cos ( theta + 240^(@)) then xy+ yz+ zx=1 II : cos alpha + cos (120^(@) + alpha ) + cos (120^@ - alpha ) =0

Prove that, cos alpha + cos(120^(@) + alpha) + cos (120^(@) - alpha) = 0

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

If xcostheta=ycos(theta+120^(@))=z cos (theta+240^(@)) then xy+yz+zx=

Prove that cos alpha cos (120^(@) + alpha) cos (240^(@) + alpha) = 1/4 cos 3 alpha

Prove that cos^2alpha+cos^2(120^@-alpha)+cos^2(120^@+alpha)=3/2