$\int\left(\frac{10}{\left(x^2-1\right)^2}\right)dx$

$14d-16d+11$

$x^2+12x+25x^2$

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

$\sin\left(arctan\left(9x\right)-arccos\left(x\right)\right)$

$\frac{\tan\left(-60^{\circ}\right)}{\cos\left(-\frac{\pi}{4}\right)}$

$-\frac{4}{5}x=12$