$$4\sin^2x+7\sin x=2$$

$$\int48\sin\left(2x\right)\cdot\cos\left(4x\right)\cdot dx$$

$$33-30.6$$

$$+4-15+6-20-3$$

$$\int\frac{x^3+5x^2+2x+\:3}{x^2\left(x^2+1\right)}dx$$

$$25\left(6-x\right)^{-1}=x+4$$