$\int_2^5\left(x^2\arctan\left(x\right)\right)dx$

$\ln\left(y\right)=\ln\left(\frac{\left(2x-5\right)^3}{x^2\left(x^2+1\right)^{\frac{1}{2}}}\right)$

$-sen^2x+3senx-2$

$25z^4+10z^4+1$

$\int\frac{13}{x}dx$

$\left(5x^3-17x^2-13x+7\right):\left(x-4\right)$

$-2x^2-3x-3$