$\cot\frac{x}{2}=1$
$\left(x^2-1\right)-\left(\left(1+x\right)^{\frac{3}{2}}\right)^2$
$3\cdot22\cdot4$
$\int ln7xdx$
$\left(s^2+1\right)\frac{dt}{ds}3st=6s$
$\frac{dy}{dx}=\frac{2x}{x-4z}$
$\lim_{x\to0}\left(x+\pi\right)\cot\left(x\right)$
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