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打勾的这三道题怎么做

2025-03-17 08:46:32

推荐回答（3个）

回答1：

如下

回答2：

解:1,（6）y'=-2cscxcotx/(1+x^2)+2cscx*(-1)*2x/(1+x^2)^2
=-2cscxcotx/(1+x^2)-3xcscx/(1+x^2)^2=-(2cscxcotx+4x^2cscxcotx+3xcscx)/(1+x^2)^2
(7) y'=(2/x+3x^2)/(3lnx+x2)+(2lnx+x^3)*(-1)*(3/x+2x)/(3lnx+x^2)^2
=(2+3x^3)/[x(3lnx+x^2)]-(3+2x^2)(2lnx+x^3)/[x(3lnx+x^2)^2]
=(9x^3lnx-4x^2lnx+x^5-3x^2+2x^2)/[x(3lnx+x^2)^2]
2,(7) y'=e^tan(1/x)*[sec(1/x)*(-1/x^2)=-sec(1/x)e^tan(1/x)/x^2

回答3：

题解

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