Sage:
def h(x): return 1/((x + 1)^(1/3) + 1)
hint = integral(h(x), (x, -6, -2))
hint.n()
Exception ValueError: ValueError('negative number to a fractional power not real',) in 'sage.gsl.integration.c_ff'
Maple:
int(1/((x+1)^(1/3) + 1), x = -6..-2):
evalf(%);
1.562667835 - 1.105160054 I
