$5x+3y,\:x=2,\:y=1$

$\int_0^{\pi}\left(\pi^2-x^2\right)cos\left(nx\right)dx$

$\left(-4\right):\left(-2\right)$

$\lim_{x\to\infty}\left(\frac{8x^2}{cos\left(x\right)-1}\right)$

$\frac{m^2-6m+9}{m^2-m-6}\cdot\frac{m^2+2m}{m^2+2m-15}$

$a^8-144$

$\left(-4\right)^3-13\cdot$