$\frac{\cos^{2}\theta}{-\sin\theta}=1+\sen\theta$

$\lim_{x\to+\infty}\left(\frac{2x^2+5x-1}{x^3+x}\right)$

$\left(x\right)^2+\left(81\right)^2$

$x\left(5amy\right)^2$

$4\sqrt{85.3\cdot7.28}$

$-14+\left(-22\right)\:-60$

$3 x ^ { 5 } - 2 x ^ { 2 } + 9 x ^ { 4 } - 5 x + 3$