We can use the chain rule and the given identities to find the derivative of \(\cos x\) with respect to \(x\) as follows: $$\frac{\mathrm{d}}{\mathrm{d}x} \cos x = \frac{\mathrm{d}}{\mathrm{d}x} \sin\left(\frac{\pi}{2} - x\right)$$ Using the chain rule, we can write this as: $$\frac{\mathrm{d}...
笛卡尔叶形线的极值问题——Find the highest point on the loop of the folium of Descartes whose equation is $x^{3}+y^{3}=3xy$
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