$\int me^mdm$

$2x^2y-3xy^2=4xy-2y$

$36x+2+9$

$2x^2+x+1=x^2-3x-3$

$\left[\left(-8\right):\left(-2\right)-6:\left(2-5\right)\right]\::\:\left[10:\left(-2\right)-3:\left(1-2\right)\right]$

$\cot\left(u+v\right)=\frac{cot\left(u\right)cot\left(v\right)-1}{cot\left(u\right)+cot\left(v\right)}$

$\int x\cdot\cos\left(x^2+4\right)\cdot\sqrt{sin\left(x^2+4\right)}dx$