from __future__ import division
from math import pi
R1=1*10**3#
R2=100*10**3#
Rf=R2#
f1=159#
C=1/(2*pi*R2*f1)#
print 'C=%0.2e microF'%C
from __future__ import division
from math import pi
R1=1*10**3#
Rf=51*10**3#
Cf=0.1*10**-6#
f=1/(2*pi*Rf*Cf)#
print 'f=%0.2f HZ'%f #ans given in book is wrong
fmin=10*f#
print 'fmin=%0.2f HZ'%fmin
from __future__ import division
from math import pi
R1=10*10**3#
Cf=0.01*10**-6#
f=1/(2*pi*R1*Cf)#
print 'f=%0.2f HZ'%f #ans given in book is wrong
fmin=f/10#
print 'fmin=%0.2f HZ'%fmin
from __future__ import division
from math import pi
R=51*10**3#
C=0.001*10**-6#
f0=1/(2*pi*R*C)#
print 'f0=%0.2f HZ'%f0