T=d f ld mf
V=x
R=-10,10,.025
F=(x^2)^(1/7) + 1.1*(x^4)^(1/5) + 1.2*(x^6)^(1/3)
C=fp_pow(x*x, 1/7) + 1.1*fp_pow(x*x*x*x, 1/5) + 1.2*fp_pow(x*x*x*x*x*x, 1/3)
