$\left(\frac{2}{5}xy-\frac{3}{4}x^2n+1\right)^2$

$1\frac{2}{x+1}=\frac{3}{x-1}$

$\frac{\left(\sqrt{18}x-78\right)}{8}^2$

$\lim_{x\to0}\left(\frac{\sin\left(5x\right)-11x}{3e^{-2x}-3}\right)$

$\int_0^{90}\sin\left(x\right)dx$

$\lim_{x\to0}\left(\frac{-3sin\left(9x^7\right)}{2x}\right)$

$\int\left(\left(3x-4\right)^7\right)dx$