由参数方程{x=acosty=bsint\begin{cases}x = a \cos t \\ y = b \sin t\end{cases}{x=acosty=bsint确定的函数y=y(x)y = y(x)y=y(x)的导数dydx=\dfrac{dy}{dx} =dxdy=( ).
(A)batant\dfrac{b}{a} \tan tabtant
(B)bacott\dfrac{b}{a} \cot tabcott
(C)−batant-\dfrac{b}{a} \tan t−abtant
(D)−bacott-\dfrac{b}{a} \cot t−abcott
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