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f = x^2*sin(2*x)
f(50)=689613692941107200*sin(2*x)+56294995342131200*x*cos(2*x)-1125899906842624*x^2*sin(2*x)
4Â¥2014-11-03 06:13:47
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2Â¥: Originally posted by Edstrayer at 2014-11-03 02:04:49
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y=f(x)=x^2\sin(2x)
ÊÔÇóy^{(50)}=f^{(50)}(x)=?

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5Â¥: Originally posted by feixiaolin at 2014-11-03 09:39:36
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y'=¡­¡­
y¡°=¡­¡­
y¡°+2y=¡­¡­
y^(4)+2y"=-4
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8Â¥2014-11-03 18:32:23
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