$\int tan\left(2x+1\right)dx$

$\int\frac{3x^2+5}{\left(x^2+4\right)^2}dx$

$\frac{5-6y}{3}\le1-2y$

$\lim_{x\to4}\left(\frac{x^2+3x-18}{x-3}\right)$

$\left(4y^7+2^3\right)+\left(4x+5y^3+9x^2\right)$

$\lim_{x\to-\infty}\left(\frac{13x}{100-x}\right)$

$\frac{d}{dx}x^4\:+\:x^2y^2\:+\:y^3\:=\:4$