I'd not really thought about trying parameters till you pointed out the double maxima thing. I've spoken to someone else about this and they agree that if I put in a constraint that g>0 it should work. I've not been able to test it, as I don't have Maple on this computer, but I've been told this should solve the problem. Thank you again for your help.

I'd not really thought about trying parameters till you pointed out the double maxima thing. I've spoken to someone else about this and they agree that if I put in a constraint that g>0 it should work. I've not been able to test it, as I don't have Maple on this computer, but I've been told this should solve the problem. Thank you again for your help.

I've just run the plot for g=-5E-3..5e-3, h=-10E-3..10E-3 (something I couldn't do earlier, because the computer wasn't powerful enough!) and there are indeed two peaks that form for g<0. However for the system this is simulating it doesn't correspond to a physical situation. Sorry, I probably should have explained what this is meant to be earlier; it's the magnetic field generated by two cube magnets placed a distance 'g' apart and measured at a distance 'h' from the axis passing through the centre of the two magnets. Therefore, g can't be less than 0. I'd not thought about it before, but maybe this means I would need to include some sort of parameter in the equation to get the maximum. I really appreciate the help, I've been stumped by this problem! Thanks

I've just run the plot for g=-5E-3..5e-3, h=-10E-3..10E-3 (something I couldn't do earlier, because the computer wasn't powerful enough!) and there are indeed two peaks that form for g<0. However for the system this is simulating it doesn't correspond to a physical situation. Sorry, I probably should have explained what this is meant to be earlier; it's the magnetic field generated by two cube magnets placed a distance 'g' apart and measured at a distance 'h' from the axis passing through the centre of the two magnets. Therefore, g can't be less than 0. I'd not thought about it before, but maybe this means I would need to include some sort of parameter in the equation to get the maximum. I really appreciate the help, I've been stumped by this problem! Thanks