$\csc\left(\arctan\left(4x+1\right)\right)$

$3x^2+5x+20x^2$

$\lim_{x\to0}\left(\cos\left(x\right)\left(1+\tan\left(2x\right)^{\frac{4}{x}}\right)\right)$

$\left(3m+8b\right)^3$

$\frac{2\cdot107}{63\times10^{-27}\cdot123\times10^{-9}}$

$t\cdot\frac{dx}{dt}=x\left(1-t\right)$

$5y\:+\:3\:+\:4y\:-\:2\:+\:3y\:+\:8\:-\:4$