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dashuai_17

Òø³æ (СÓÐÃûÆø)

[ÇóÖú] (SAT) use complex numbers to derive the formulas instance sin3x=3sinx-4sin^3x

(SAT) use complex numbers to derive the formulas instance.
sin3x=3sinx-4(sinx)^3
cos3x=4(cosx)^3-3cosx
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dashuai_17: ½ð±Ò+2 2012-06-15 15:30:55
dashuai_17: ½ð±Ò+3, ¡ïÓаïÖú 2012-07-03 09:14:44
Å·À­¹«Ê½exp(ix)=cosx+isinx
Á¢·½ºÍ¹«Ê½a^3+b^3=(a+b)(a^2+b^2-ab)
i=(-1)^1/2,i^2=-1
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