(cosx)∧2+cos(x+120°)∧2+cos(x+240°)∧2的值为

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(cosx)∧2+cos(x+120°)∧2+cos(x+240°)∧2的值为(cosx)∧2+cos(x+120°)∧2+cos(x+240°)∧2的值为(cosx)∧2+cos(x+120°)∧2

(cosx)∧2+cos(x+120°)∧2+cos(x+240°)∧2的值为
(cosx)∧2+cos(x+120°)∧2+cos(x+240°)∧2的值为

(cosx)∧2+cos(x+120°)∧2+cos(x+240°)∧2的值为
cos(x+120°)∧2+cos(x+240°)∧2
化成cos(x-60°)∧2+cos(x+60°)∧2
再拆开
=1.5