[理工] [工數]-ode
1.∫e^(x^2)dx 要怎麼積分
2. y''+y=secx
老師的答案:c1cosx+c2sinx-(cosx)(ln∣secx+tanx∣)
我算的答案:c1cosx+c2sinx-(cosx)(ln∣secx+tanx∣+sinx)
3.4y''+36y=csc3x
老師的答案:c1cos3x+c2sin3x-(1/12)xcos3x+(1/36)(sin3x)(ln∣sin3x∣)
我算的答案:c1cos3x+c2sin3x-(1/3)xcos3x+(1/9)(sin3x)(ln∣sin3x∣)
請各位工數高手幫幫忙 看是我錯還是答案錯
4.(x-1)y''-xy'+y=0 這題一直解不出來 答案:c1e^x+c2x
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