$\frac{d}{dx}x^3-xy-2=0$
$x^{2}+y^{3}=5$
$5x-2<16-4x$
$x-\sqrt{x+3}=9$
$\frac{3x^2}{3x}$
$\lim_{x\to0}\left(\frac{3a\cot\left(a\right)-1}{a}\right)$
$\left(\sin x+1\right)\left(\sin x-1\right)=-\cos^2x$
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