$xy^2y'=x+1$

$cot\left(x\right)=\frac{1+cot^2\left(x\right)}{csc\left(x\right)sec\left(x\right)}$

$14-24:3+6:\left(-2\right)$

$ln\left(x+8\right)\:-\:ln\:\left(8\right)\:=\:3$

$\frac{dy}{dx}=40y+x$

$2\sin\frac{5\pi}{3}\cot\frac{3\pi}{4}\sec\frac{11\pi}{6}$

$2x^2+5x-6x-15$