$-7-0.5-4$

$3\cdot4^2-1$

$\lim_{x\to-\infty}\left(\frac{8x^2+x}{x+6}\right)$

$\frac{2^nx^{2n}}{3^{n+1}}$

$yinydx+xdy=0$

$\sin^2\left(x\right)\cdot\cot\left(x\right)+cos\left(x\right)\cdot sen\left(x\right)+\tan^2\left(x\right)$

$2x^2-4+4$