$4\left(1+a\right)^2-4\left(1+a\right)\left(b-1\right)-\left(b-1\right)^2$

$\int sen\left(lx\right)dx$

$dy+2xy^2dx=0$

$\lim_{x\to0}\left(\frac{\left(ln\left(sinx\right)\right)}{lnx}\right)$

$\left(8e+6f\right)^2$

$\frac{9x^2-144y^2}{9x-12y}$

$\int_0^{\infty}e^{-\left(x+y\right)}dy$