$m^2+9m^2+20$

$1-2\cot\left(x\right)^2$

$\frac{dy}{dx}=\frac{1}{x^2};y\left(1\right)=5$

$\int\left(\left(tanx\right)^3\left(secx\right)^2\right)dx$

$2\cdot\left(-3\right)-\frac{21}{\left(-7\right)}-5+3$

$\int\frac{4x^2}{x+4}dx$

$18-3.\left(12-15\right)+3.\left(6-4\right).\left(5-9\right)$