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Question: How do I solve this integral step by step?

Question:How do I solve this integral step by step?

thiagovannucci 0
January 17 2013
0 
restart;
eta:=10^(-2.623+(3388.8/(T-491))):
DG:=51749.47800-33.65211624*T-0.4480891609E-2*T^2:
N:=((T/eta)*(exp(108.3606-(3.02397E13/(T*(DG^2)))))):
B:=(1.5438E-6*A*(1307-A))/(10^(-2.623+3388.8/(A-491)))*(1-exp(-abs(51749.478-33.6521*A-0.0044809*A^2)/(8.31*A))):
G:=int(B,A=500..T):
H:=G^3:
J:=N*H:
q:=evalf(int(J,T=500..1307)):
Rcc:=evalf((((4*Pi/3)*q)/1E-6)^(1/4));
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