Python converting radian to degree

from sympy import Symbol, Derivative, cos
import math 
pi= math.pi

t= Symbol('t')

function_t = 2*cos(2*math.pi*t)*2.718**(-(math.pi*t)/2)
f1 = (function_t.doit().subs({t:1.5}))
print("When t=1.5,", f1)

I can't find a way to calculate cos in degrees in this function.

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