$3x^2-2\cdot x^2-1$

$\left|-4\right|\:\cdot\left|2\right|+\left|-8\right|$

$\left(cot\:x\:-1\right)^2+\:\left(cot\:x\:+1\right)^2=\:2\:csc^2x$

$\left(-2+3-9+4\right)-\left(3-12\right)$

$\frac{2-2\sin\left(x\right)^2}{2\sin\left(x\right)\cos\left(x\right)}=\cot\left(x\right)$

$\left(a-x\right)^5$

$\int\left(\sqrt{2s-3}\right)ds$