$\lim_{x\to\infty}\left(\frac{\left(10-6x^2\right)}{5+3e^x}\right)$

$y=\frac{1}{2}x-4$

$\frac{1}{2}sen\left(2x\right)+\frac{cos\left(x\right)^2}{sen\left(x\right)}=cot\left(x\right)\cdot cos\left(x\right)+cot\left(x\right)\cdot sen\left(2x\right)$

$\frac{\left(x^5+x^2-2\right)}{\left(x+1\right)}$

$\lim_{x\to\infty}\left(\left(-\frac{0.25.x^3}{x^4+0.25\cdot x^2}\right)^2\right)$

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

$y=\frac{1}{\left(2x^2+x\right)^3}$