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Program to determine the value of golden ratio (phi)

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#                                                                                                    t_n+1
# Program to determine the value of golden ratio (phi) = lim   ---------
#                                                                                          n->inf  t_n
n=input("Enter the decimal place upto which correction is required:")
a=1.0
b=1.0
c=a+b
R1=c/b
R2=b/a
e=R1-R2
n=float(n)
while abs(e)>=n:
 a=b
 b=c
 c=a+b
 R1=c/b
 R2=b/a
 e=R1-R2
print("The value of the Golden ratio is",R1)
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