$12x-9\left(4x^4+12x^3-9x^2\right)$

$2\cos^2\left(a\right)-\sin2\left(a\right)\cdot\csc\left(a\right)=0$

$49x^2-54x+25$

$\int13xe^{7x}dx$

$\int\frac{-2x+6}{x\left(x^2-1\right)}dx$

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

$2\sqrt{20}+3\sqrt{5}$