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

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

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

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

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

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

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

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

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

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

$\mathrm{Integrand}\left(\frac{\∫\∫\sin \left(xy\right)\ⅆy\ⅆx}{c}\+\∫\cos \left(x\right)\ⅆx\right)$

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

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

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