$\left|6-8\right|por\:\left(-2\right)$

$\lim_{x\to\pi}\left(\frac{sin\left(2x\right)}{\pi-x}\right)$

$\sqrt{1+\tan^2\left(x\right)}$

$\left(5d+3\right)\left(3d+7\right)$

$3-1^2-4+1+2$

$8x^2-2x+8$

$\frac{1}{2}\sqrt[4]{\frac{9x^2y^2}{z^2}}+\frac{1}{3}\sqrt[6]{\frac{27x^3\:y^3}{z^3}}$