$-\left[-13+\left(2\right)\right]\cdot\left(6-8\right)-\left(-4\right)\cdot\left(9\right)$

$\log_x\left(104\right)=y$

$\sqrt{3x+1}x=0$

$\left(2\cdot\cos+1\right)\cdot\left(2\cdot\sin\left(x\right)-\sqrt{2}\right)=0$

$31.804+2.15+48.6300+120.10$

$\int\left(-4x^2\right)dx$

$\int\:\frac{\left(x+2\sqrt{x}\right)\left(x-2\sqrt{x}\right)}{x}dx$