Question

dx2 sinx诸位好友帮帮忙吧.不好意思,我一穷二白,家徒四壁,身无长物,没积分了.

Answer 1

问题没读懂,

[1]dx^2/dsinx=2xdx/cosxdx=2x/cosx?

[2]d(x^2*sinx)=sinxdx^2+x^2dsinx=2xsinxdx+x^2dx=(2xsinx+x^2)dx

或者d(x^2*sinx)=(x^2*sinx)'dx=(2xsinx+x^2)dx

[3]我理解的要是不对,站内M我