$-7+6a^2-10a$

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

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

$a^2+2\cdot abt+b^2\cdot t^2$

$\lim_{x\to0}\left(\frac{tan^2\left(x\right)-sen^2\left(x\right)}{x^4.5}\right)$

$1x^2+\:4x+13$

$\int x^2\sqrt{10+x^2}dx$