The Integrand(f) command returns a list containing the integrands found in f, sorted by integration nesting level.

$\mathrm{with}\left(\mathrm{Student}\left[\mathrm{Calculus1}\right]\right)\:$

$R≔\mathrm{Int}\left(\sin \left(x\right)+3\,x\right)$

$R≔\int \left(\sin \left(x\right)+3\right)\ⅆx$

$\mathrm{Integrand}\left(R\right)$

$\left[\sin \left(x\right)+3\right]$

$\mathrm{R1}≔\mathrm{Rule}\left[\mathrm{sum}\right]\left(R\right)$

$\mathrm{R1}≔\int \left(\sin \left(x\right)+3\right)\ⅆx=\int \sin \left(x\right)\ⅆx+\int 3\ⅆx$

$\mathrm{Integrand}\left(\mathrm{R1}\right)$

$\left[\sin \left(x\right)\,\sin \left(x\right)+3\,3\right]$

$\mathrm{Integrand}\left(\frac{\mathrm{Int}\left(\mathrm{Int}\left(\sin \left(xy\right)\,y\right)\,x\right)}{c}+\mathrm{Int}\left(\cos \left(x\right)\,x\right)\right)$

$\left[\sin \left(xy\right)\,\cos \left(x\right)\,\int \sin \left(xy\right)\ⅆy\right]$

$\mathrm{Integrand}\left(\right)$

$\left[\sin \left(xy\right)\right]$