$\int\frac{4x^2-9x-4}{x^3-x^2-2x}dx$

$\frac{10}{x^2-4x-21}$

$\int\left(\frac{3x^2-10x+2}{x^3-5x^2+2x+8}\right)dx$

$\int_{\frac{\pi}{-4}}^{\frac{\pi}{6}}\left(-\sec\left(x\right)\tan\left(x\right)\right)dx$

$9a^2-30ab^2+25b^4$

$\frac{tan\left(t\right)+cot\left(t\right)}{csc\left(-t\right)}$

$-10+2.7$