$\left(5\right)\left(-3+25\right)$

$\frac{cos\left(x\right)\:\cdot cos\left(2x\right)}{cos\left(x\right)-sen\left(x\right)}+\frac{1}{2}sen\left(2x\right)+sen^2\left(x\right)$

$\frac{4n^2-7n^2+n^2}{2n+1}$

$8x^3-36x^2+54x^2-27x^3$

$-13+14+27-18-38$

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

$\int x\cdot e^{\frac{1}{3}x}dx$