$7n^2\left(n^4-4n^3-n^2+2n+3\right)$

$\frac{dy}{dx}y=\frac{1}{5}x^5-3x^4+9x^2+1$

$\left(3x+5y\right)^5$

$\lim_{x\to1}\left(\frac{1-x^2}{\left(1+ax\right)^2-\left(a+x\right)^2}\right)$

$\left(5^1\right)^4\left(3^2\right)^2$

$-5\left(3+4x\right)=125$

$2-2\left[3-2\left(5-3\right)3-3\right]2$