$\sec\left(\theta\right)-tan\left(\theta\right)=\:\frac{cos\left(\theta\right)}{1+sin\left(\theta\right)}$

$-\frac{12a^2}{-3a}$

$10x^2-15xy^2+25xy$

$\frac{64\left(y^{12}-1\right)}{2y^2+z}$

$\frac{dy}{dx}=2x^2+4x+1,y\left(0\right)=6$

$\left(y^2+2+y\right)+3y+2$

$25x^2\:-\:5x\:-\:2$