函数y=y(x)y = y(x)y=y(x)由参数方程{x=t2,y=lnt+1\begin{cases}x = t^2, \\ y = \ln t + 1\end{cases}{x=t2,y=lnt+1所确定,则dydx=12t2\dfrac{dy}{dx}=\dfrac{1}{2t^2}dxdy=2t21.( )
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