The system does not automatically return the
constant of integration–the ``arbitrary constant,'' so you
must remain alert and add the constant when
needed. Simply enter ``+ C '' to change from


2
x2 + 3
x + 5

d
x =
x3 +
x2 + 5
x
to


2
x2 + 3
x + 5
dx =
x3 +
x2 + 5
x +
C
Such constants are needed, for example, if you have a formula for
acceleration and you wish to find an expression for velocity.