XITRIGOQ028 _ If x=y cos⁡〖2π/3〗=z cos⁡〖4π/3〗, then xy+yz+zx=

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If x=y cos⁡〖2π/3〗=z cos⁡〖4π/3〗, then xy+yz+zx=
XITRIGOQ028
(a) – 1 (b) 0
(c) 1 (d) 2

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