$\lim_{x\to0}\left(\frac{\sin\left(14x\right)}{x}\right)$

$e^{x+2y}=e^{2x-y}.y^'$

$\frac{1^2-1}{1^3+3\left(1\right)-4}$

$\lim_{x\to27}\left(\frac{x^2-729}{621-4x-x^2}\right)$

$\lim_{x\to\infty}\left(5x\left(\frac{1}{2}\right)^x\right)$

$\frac{\left(-2^n\right)}{\left(2^n\right)\left(n+3\right)}$