$\lim\:_{x\to\:\infty}\left(\frac{\pi-2\arctan\left(x\right)}{e^{\frac{3}{x}}-1}\right)$

$2x^2+28x+196$

$5n^{2}+15n^{8}$

$\left(6x-\frac{1}{3}y\right)\left(6x+\frac{1}{6}y\right)$

$\int14x^2\cdot\cos\left(x\right)dx$

$x^2+16x+62=0$

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