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[tex] \frac{y}{x} = \frac{ \sin(t) }{ \tan(t) } \\ [/tex]
[tex] \frac{dy}{dx} = \frac{( \sin(t))'}{( \tan(t))'} \\ [/tex]
[tex] \frac{dy}{dx} = \frac{ \cos(t) }{ {sec}^{2}(t) } \\ [/tex]
[tex] \frac{dy}{dx} = \frac{ \cos(t) }{ \frac{1}{ {cos}^{2}(t) } } \\ [/tex]
[tex] \frac{dy}{dx} = {cos}^{3}(t) \\ [/tex]
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