$\frac{d}{dx}e^{7x^5}^{+2x^4}$

$\lim_{n\to infinity}\left(\frac{0.75e^{\frac{t}{n}}}{1-0.25e^{\frac{t}{n}}}\right)^n$

$111\cdot111$

$3c\left(b+a\right)-6d\left(b+a\right)$

$\lim_{x\to0}\left(\frac{1+\cos\left(x\pi\right)}{x^2-1}\right)$

$\frac{du}{dx}=e^{2x-u}$

$\int\left(2x-1\right)^4x^2dx$