$\int\frac{7x+4}{x^2+7x+6}dx$

$-\left(5+\left(4-1\right)\right)-\left(2-\left(8-\left(3+2\right)\right)\right)+\left(5-9\right)-\left(-3\right)$

$2\left(4a+b\right)+3\left(a-3b\right)$

$3x^2+x^2+x\:$

$\frac{-35000}{-5}$

$\frac{\left(2sen^2\left(o\right)-1\right)^2}{sen^2\left(o\right)-cos^2\left(o\right)}=1-2cos^2\left(o\right)$

$9x^2+2xy^2=-4$