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188Â¥2015-11-26 08:23:51
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190Â¥2015-11-26 08:24:44
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10Â¥: Originally posted by cnhhwen at 2015-11-26 02:08:34
ÕâÑù£¿²»¹ýÇó½âµÄʱºòÖ»ÄÜÓÃmatlabÇóÊýÖµ½âorz

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cos(theta) =   ¡Ì2/2,-¡Ì2/2,-1/2
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theta = 45¡ã
191Â¥2015-11-26 08:28:15
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198Â¥2015-11-26 08:32:20
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Edstrayer: ½ð±Ò+3, rs 2015-11-28 05:10:14
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10Â¥: Originally posted by cnhhwen at 2015-11-26 02:08:34
ÕâÑù£¿²»¹ýÇó½âµÄʱºòÖ»ÄÜÓÃmatlabÇóÊýÖµ½âorz

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Áîx = cos(theta)
4x^4+2x^3-2x-1=0
2x^3(2x+1)=(2x+1)
´Ó¶øx1=-1/2;
x^3=1/2;
x2 = Èý´Î¸ùºÅ(1/2)

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