$6n+3+2n$

$153\cdot8$

$\int\frac{1}{\left(4-\sin\left(x\right)\right)}dx$

$\frac{\left(\sin\left(x\right)-\cos\left(x\right)\right)\left(\sin\left(x\right)+\cos\left(x\right)\right)+\cos^2\left(x\right)}{\sin\left(x\right)}$

$\int_{-\pi}^0\left(sen\left(20x\right)cos\left(15x\right)\right)dx$

$351+441$

$\frac{dy}{dx}=\frac{-2xy}{x^2+y^2}$