$7^8\cdot2^8$

$\lim_{x\to\infty}\left(\frac{3}{2^x}\right)$

$\int\:\left(\frac{3}{2x}\left(\frac{6}{7\sqrt[4]{x}}+\frac{8}{x^4}-\frac{3x^5}{4}\right)\right)dx$

$\left(5ab-7c^3\right)^2$

$\left(\sqrt{25x^2-4}\right)\frac{1}{x}$

$\lim_{x\to0}\left(1-\cos\left(x\right)\right)ctg\:\left(x\right)$

$2\cot^2\:=\:\frac{1}{sec+1}-\frac{1}{sec\:-1}$