$\lim_{x\to1}\left(\frac{sen\left(x-1\right)}{x^2-3x+2}\right)$

$\left(-285\right)+\left(-485\right)+36$

$3\left(40x+9\right)$

$\lim_{x\to\infty}\left(\frac{\ln\left(4\right)}{1+\ln\left(x\right)}\right)$

$\lim_{x\to3}\left(\frac{-2x^2+11x-15}{x-3}\right)$

$a^2+14=a^2\cdot5-130$

$\left(9x^2y+8xy^2-6xy\right)-\left(15x^2y+9xy-3xy^2\right)$