Проблемы с вычислением интеграла

import sympy as sp
F = 100
x1 = 0.0001; x2 = 1; z1 = 0.0001; z2 = 1;
x, z = sp.symbols('x z')
 
A = None
B = sp.cos(z)
 
def R1(f, arg): return (sp.integrate(f * f, (arg, 0, 1)))
def R2(f, arg): return (sp.integrate(f * sp.diff(f, arg, 2), (arg, 0, 1)))
def R3(f, arg): return (sp.integrate(-F * f, (arg, 0, 1)))
 
def CalculationC2(func, arg1, arg2, k, L): return ((func.subs({z : z2})*(F-L*func.subs({z : z1}))*sp.exp(k*arg2)-func.subs({z : z1})*(F-L*func.subs({z : z2}))*sp.exp(k*arg1))/(func.subs({z : z1})*func.subs({z : z2})*(sp.exp(-k*arg1)*sp.exp(k*arg2)-sp.exp(-k*arg2)*sp.exp(k*arg1))))
def CalculationC1(func, arg1, arg2, k, L, C2): return ((F-(func.subs({z : z1})*C2*sp.exp(-k*x1))-(func.subs({z : z1})*L))/(sp.exp(k*x1)*func.subs({z : z1})))
 
def CalculationC4(func, arg1, arg2, k, L): return (((F-func.subs({x : z1})*L)*func.subs({x : z2})*sp.cos(k*arg2)-(F-func.subs({x : z2})*L)*func.subs({x : z2})*sp.cos(k*arg1))/func.subs({x : z2})*func.subs({x : z1})*sp.sin(k*(arg1-arg2)))
def CalculationC3(func, arg1, arg2, k, L, C2): return ((F-func.subs({x : z1})*L-func.subs({x : z1})*C2*sp.sin(k*arg1))/func.subs({x : z1})*sp.cos(k*arg1))
 
L = float(R3(B,z)/R2(B,z))
k = float(sp.sqrt(-R2(B,z)/R1(B,z)))
C2 = float(CalculationC2(B, z1, z2, k, L))
C1 = float(CalculationC1(B, z1, z2, k, L, C2))
A = C1*sp.exp(k*x)+C2*sp.exp(-k*x) + L
print(А)
L = float(R3(A,x)/R2(A,x))
k = float(sp.sqrt(R2(A,x)/R1(A,x)))
C2 = float(CalculationC4(A, x1, x2, k, L))
C1 = float(CalculationC3(A, x1, x2, k, L, C2))
B = C1*sp.cos(k*x)+C2*sp.sin(-k*x)+L
print(B)