Evaluate this indefinite integral (world) joy^world-1d (joy)

Let be y = world, and joy=x

so we have integral (world) joy^world-1d (joy) = integ (yx^y-1) dx, y is a constant independant of x, so integ (yx^y-1) dx = y. integ (x^y-1) dx

=y. (x^y-1+1 / y-1 + 1) + C = (x^y) + C

the answer is joy^world