$\frac{d^3}{dx^3}\:\left(\:\:x^2\:senx\right)$

$\ln\left(6x\right)-\ln\left(x+1\right)=\ln\left(3\right)$

$\lim_{x\to9}\left(\frac{x^3-3x-54}{x-9}\right)$

$\int\left(x\cdot\left(x^2-4\right)^2\right)dx$

$9w+8=80$

$\int r\cdot ln\left(r\right)dr$

$\int x\cdot sin\left(kwx\right)dx$