$\lim_{x\to0}\left(\frac{1+sen4x}{-cotgx}\right)$

$\int_{0.5}^1\left(\frac{\arccos\left(\sqrt{x}\right)}{\sqrt{x}}\right)dx$

$\sqrt{x^6}y^4$

$\lim_{x\to infinity}\left(\ln\left(6x^3+7\right)-ln\left(2x^3-3x\right)\right)$

$\int\frac{xd}{x^2+7x+6}$

$x^2-10x+28=7$