from sympy import diff


def perform_tangent_method(a, b, eps):
'''Equation solution by tangent(Newton) method'''
x_prev = b
while True:
    try:
        x = x_prev - (func(x_prev)/diff(func(x_prev)))
    except ZeroDivisionError:
        return 'ERROR: Zero division!'
    if abs(x - x_prev) <= eps:
        break
    else:
        x_prev = x
return x