$3c^3\cdot5$

$\int\frac{x^2-x-1}{\left(x^2+2\right)^2}dx$

$y'-y\:tan\:x\:=1$

$cos^2\theta\:-sin^2\theta\:=1-2sin^2\theta\:$

$\lim_{x\to4}\left(\frac{4x+16}{x^2+16}\right)$

$\int_{\sin\left(\pi x\right)}^{\sqrt[3]{x}}t^2\ln\left(t+1\right)dt$

$\frac{x^3+4x^2-6x+1}{x+3}$