$\left(3x^2a+\frac{1}{2}\right)\left(3x^2a-\frac{1}{3}\right)$

$\frac{1-\cos\left(x\right)^2}{\cos\left(x\right)-\cos\left(x\right)^2}=1+\frac{1}{\cos\left(x\right)}$

$\frac{d}{dx}\sqrt{x^2+1}$

$\left(+24\right)\::\:\left(-24\right)$

$3\int e^{2x}\sin\left(3x\right)dx$

$\left(+2\right)\cdot\left(+4\right)\cdot\left(-8\right)\cdot\left(+7\right)$

$\frac{dy}{dx}\left(\frac{1+2y^3}{y\:cosx}\right)$