Sheet Metal Custom Equation

[MrSmithtastic]

I'm trying and failing to get a custom unfold equation to work. I have no idea what I'm doing wrong here....

Equation is

(π*β*(μ*((((μ*2)*180)/(\π*90*μ))-(ρ/μ))+ρ))/180

I've tested the equation with values manually input and it works so I really don't know what's going on. 

Could anyone please help? Thanks

[MrSmithtastic]

cancel this, got it working.

(π *(β/180deg*π)*(μ*((((μ*2)*180)/(π *90*μ))-(ρ/μ))+ρ))/180