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(Cosx)2 =(1 + COS(2倍))/ 2 COS(2×)= 1 -!(2X)^ 2/2 +(2X)^ 4/4!-(2倍)^ 6/6 +… (cosx)2 = 1 +(1/2)(-!(2×)^ 2/2 +(2×)^ 4 / 4 -(2倍)^ 6/6 + .)!
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