(1-cos2x)*(1+cos2x)等于多少拜托各位大神(1-cos2x)*(1+cos2x)等于多少 求救厄
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(1-cos2x)*(1+cos2x)等于多少拜托各位大神(1-cos2x)*(1+cos2x)等于多少 求救厄
(1-cos2x)*(1+cos2x)等于多少拜托各位大神
(1-cos2x)*(1+cos2x)等于多少 求救厄
(1-cos2x)*(1+cos2x)等于多少拜托各位大神(1-cos2x)*(1+cos2x)等于多少 求救厄
(1-cos2x)*(1+cos2x)=1-(cos2x)^2=(sin2x)^2=(1-cos4x)/2