$\left(t^3\right)\left(t^3\right)$

$79-\left(-80\right)+\left(-15\right)$

$\left(8x^2+6xy+9y^2\right)-\left(3y^2+8y^2\right)$

$\left(3x+3\right)\left(x+6\right)$

$\cos^2\left(x\right)=\sin^2\left(x\right)\cdot\cos^2\left(x\right)+\cos^5\left(x\right)$

$39=20-19sin\left(120t\right)$

$\frac{d}{dx}\left(7x^2y+3xy^2=0\right)$