$\left(9+3\right)\cdot\left(\left(-3\cdot1\right)\right)$

$\frac{dy}{dx}+3y=2x+1$

$\int\frac{9x-2}{x\left(2x-1\right)}dx$

$\frac{1+tan\left(x\right)}{1-tan\left(x\right)}+\frac{1+cot\left(x\right)}{1-cot\left(x\right)}$

$3+2\left[5\left(7-4\right)-5\right]-3$

$y=x^{\ln\left(\sqrt{x}\right)}$

$-\left\{-5+4\left\{-4-2+8\right\}+\left\{-26+9\right\}\right\}+14$