sin^2x+sin2xsinx+cos2x=1 x在第一象限,求cos x/2的值
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sin^2 2x+sin2xsinx+cos2x=1 x在第一象限,求cos x/2的值
sin^2x+sin2xsinx+cos2x=1 x在第一象限,求cos x/2的值
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