$\int\left(1-y\right)\left(2+y^2\right)dy$

$\int\left(\frac{2x^2+x-8}{x\left(x^2+4\right)}\right)dx$

$1+19a^2-14a$

$4\cdot5+4\cdot12$

$4d^2+14d+12$

$\frac{sen\left(x\right)+\frac{cos\left(x\right)}{sen\left(x\right)}}{\frac{1}{sen\left(x\right)}+\frac{sen\left(x\right)}{cos\left(x\right)}}=cos\left(x\right)$

$\left(5x^4+2y^3\right)\left(5x^4-2y^3\right)$