$3\cdot\left(x^2-3x\right)+5x$

$\int_{\pi}^{\frac{3\pi}{2}}\left(\frac{sino}{2+coso}\right)do$

$x^2+18x+2=0$

$\frac{2.\sin\left(x\right)}{\tan\left(2.x\right)}+\frac{\sin^2\left(x\right)}{\cos\left(x\right)}=\cos\left(x\right)$

$\frac{2c}{c}$

$24x^2+26+9$

$-x^3+\left(3-i\right)x^2-\left(3-2i\right)x+\left(1-i\right)$