Factor by completing the square $-3e^{-131x}\left(\frac{d}{dx}\left(c\cos\left(2x\right)\right)+\frac{d}{dx}\left(c\right)\sin\left(2x\right)\right)$

Find the integral

$\int x^3sin\left(x\right)dx$

Find the integral

$\int\left(3x^2+1\right)^6dx$

Find the integral

$\int12x^5dx$

Find the integral

$\int xsinx\:dx$

Find the integral

$\int\left(\frac{\cos\left(x\right)}{x}\right)dx$

Find the integral

$\int\left(x^3+2\right)^23x^2dx$

Find the integral

$\int\frac{cos\left(x\right)}{x}dx$