$\lim_{x\to0}\left(\frac{e^xsinx-\left(e^x-1\right)cosx}{\left(e^x-1\right)sinx}\right)$

$\lim_{x\to-1}\left(x^3+\sqrt{x+2}\right)$

$15y+6y-3x+xy$

$4x-8=-16$

$8\left(a+2\right)+2\left(2=3a\right)$

$\left(x^5y^2\right)^3\left(-3x^3y^5\right)^2\left(2xz^6\right)$

$\lim_{x\to4}\left(\frac{x^4+2x^3+x^2}{x+1}\right)$