Python math.cos() working with degrees

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import math


def calculate_cos(deg):
    rad = (math.pi / 180) * deg
    return math.cos(rad)


x1 = 0.0    # beginning of calculation in degrees
x2 = 90.0   # ending of calculation degrees

dx = 15.0   # calculation step in degrees

deg = x1

while deg <= x2:
    y = calculate_cos(deg)
    print("cos(", deg, " deg) = ", y)
    deg += dx



# Output:
# cos( 0.0  deg) =  1.0
# cos( 15.0  deg) =  0.9659258262890683
# cos( 30.0  deg) =  0.8660254037844387
# cos( 45.0  deg) =  0.7071067811865476
# cos( 60.0  deg) =  0.5000000000000001
# cos( 75.0  deg) =  0.25881904510252074
# cos( 90.0  deg) =  6.123233995736766e-17