Function Description
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	Name: Z_CHEM_TRI 
	Function: De-nature Trimer 
	Parameters: a0 a1 a2 a3 a4 a5 a6 RT 

Notes
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	Pierre Lavigne's Chemical Denaturation of Trimer

C-code for the function
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b = exp((-a[4] + a[5] * x) / a[7]);
c = b / (3.0 * a[6] * a[6]);
d = 0.5 * c;
e = sqrt(c * c * (0.25 + 0.03704 * c));
g = d + e;
h = d - e;
w = pow(g, 0.3333333) - pow(fabs(h), 0.3333333);
answer = (1.0 - w) * (a[0] - a[1] * x) + w * (a[2] - a[3] * x);