$\int\frac{1}{5}sen5xdx$

$\left(3x\:-\:1\right)\left(a\:+\:3b\right)\:-\:\left(3x\:-\:1\right)\left(a\:+b\right)$

$\int\left(6x+2\right)cos\left(9x^2+6x\right)dx$

$\int\left(\frac{1}{x\sqrt{320-2x}}\right)dx$

$-3\cdot60$

$4x^4-32x^2y^2+64y^4$

$\left(2\sqrt{xy-y}\right)dx+xdy=0$