$\left(5c^2n\right)^3$

$\lim_{t\to0}\left(\frac{t^2}{\tan\left(5t\right)}\right)$

$\int t^3\sqrt{t^2+1}dt$

$\frac{\left(a-b\right)^{2}\cdot\left(a^{-3}\cdotb^{3}\right)^{3}}{\left(a\cdotb^{2}\cdotc^{3}\right)^{-5}}$

$x^{2}+3xy+2y^{2}+4x+7+3$

$x^4-2x^2-6x-1-x^3-6x^2+4$

$\frac{6x-2}{\left(x-3\right)\left(x+5\right)}$