$\lim_{x\to0}\left(\frac{5^t-4^t}{t}\right)$

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

$32\cdot2-\left(-4\right)^2+15$

$5z^2-2y^2+14+8x^2+9y^2-4z^2-x^2$

$\frac{-81x^5y^4z}{3x^2y^4z^3}$

$\left(am^6\right)^{\frac{8}{3}}$

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