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What aspects of higher mathematics in universities can be used in high school mathematics?
LS, there was a derivative in high school, but it was only the first derivative.

However, there are some derivatives in universities, such as the derivative of implicit function (it is quite useful to deal with the tangent problem of analytic geometry), the limit of L'H?pital's law (20 10, 201,which can be used to kill the finale of Chinese studies), the second-order derivative, and the partial derivative (Lagrange multiplier method can be used if some binary maximum problems can't make up the basic inequality).

Wait, look at LZ's own meaning.