please solve it.........
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NeemPatel:
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cos2π/3 =cos4π/3 = -1/2 so
-2x = y and z = -2x and y=z
xy+yz+zx = -2x^2 +y^2 -2x^2 = -4x^2 +(-2x)^2
=4x^2 -4x^2 =0
-2x = y and z = -2x and y=z
xy+yz+zx = -2x^2 +y^2 -2x^2 = -4x^2 +(-2x)^2
=4x^2 -4x^2 =0
thanks...
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yes i understood
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