$\lim_{x\to\infty}\left(\frac{5^x-1}{5^x}\right)$

$-2cos^2\left(x\right)=0$

$\left(\frac{\left(-x+7\right)}{-1\left(x+7\right)\left(x-7\right)\left(3+\sqrt{x+2}\right)}\right)$

$84m^2x+501m^2x+604m^2x$

$\left\{+60+\left[-12-\left(4+4\right)+20\right]\right\}+\:15$

$-h^3+4h^2-5h+2$

$\int\frac{\sen^{6}x+\cos^{6}x}{\sen^{2}x\cdot\cos^{2}x}$