$25\cdot24\cdot23\cdot22\cdot21\cdot20\cdot19\cdot18\cdot17\cdot16\cdot15\cdot14\cdot13\cdot12\cdot11\cdot10\cdot9\cdot8\cdot7\cdot6\cdot5\cdot4\cdot3\cdot2\cdot1$

$\frac{x}{3}+5=10$

$\int\frac{5-4x}{\left(x+2\right)\left(x^2+5\right)}dx$

$\left(1-3ax\right)\left(3ax+\right)$

$a^2-24a+48$

$\lim_{x\to0}\frac{e^{4x}-1}{x}$

$\lim_{x\to0}\left(e^x\cos\left(9x\right)\right)$