$7\log_{0.5}\left(\frac{1}{90}\right)=t$

$y=\arctan\left(\frac{x}{7}\right)+\frac{3x-9}{7\left(x^2+2\right)}$

$\int\left(\frac{1}{\left(x+8\right)\left(x+5\right)}\right)dx$

$\lim_{x\to11}\left(\frac{1-\cos2x}{1-senx}\right)$

$4+3x<13$

$2\left(3-4\right)+\left(-3+1\right)+\left(7+1\right)-3\left(-2\right)$

$\frac{3x^3-2x^2-2x-1}{x+1}$