$\left(\frac{1}{2}\left(a\right)-3b\right)\left(3b+\frac{1}{2}\left(a\right)\right)\left(\frac{1}{4}\left(a\right)+9b^2\right)$

$\cos\left(x\right)+sin\left(x\right)tan\left(x\right)=sec\left(x\right)$

$\frac{dy}{dt}+6y=-e^t$

$\int\left(sec^3\left(5x\right)\right)dx$

$64x^2-a^6b^4$

$\int\frac{13-5x^2}{x}dx$

$-3x^2y+5xy+6x-2xy^2+5x^2y-2y+7xy$