$v\left(x\right)=3.94\cdot x-0.125\cdot x^3$

$3\left(x^2-a^2\right)$

$sec\left(b\right)+\sec\left(b\right)\cdot cot^2\left(b\right)=\frac{1}{cos\left(b\right)-\cos^2\left(b\right)}$

$\frac{\frac{x-10}{25}+\frac{1}{x}}{1-\frac{x}{5}}$

$6.467\cdot1000$

$\left(\frac{-2m^7p^5}{3a^2b^2}\right)^3$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{tanx}{ln\left(cosx\right)}\right)$