$144x^2-81y^6$

$\frac{d}{dx}x^4sin^2x$

$\sec\left(x\right)=\frac{\sqrt{205}}{14}$

$\int e^{3x}\sin\left(-5x\right)dx$

$20\sin\left(a\right)^2+44\sin\left(a\right)-15$

$\left(\frac{b}{b-2}-\frac{3}{b^2-4}\right)$

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