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feixiaolin

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Ö±½Ó³Ë  cos(10)+sqrt(3)*sin(10) +sin(20) +sqrt(3)*2*sin^2(10)
=cos(10)+sqrt(3)*sin(10) +sin(20) +sqrt(3)*[1-cos(20)]
=cos(10)+sqrt(3)*sin(10) +sin(20) - sqrt(3)cos(20) +sqrt(3)
=2*cos(50)-2*sin(40)+sqrt(3)
=sqrt(3)
2Â¥2014-12-04 08:10:45
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qiangl87

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jiangliz

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