Python - math.cos() method example

import math

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print(math.cos( 0                  ) )  # 1   <-  0 degrees

print(math.cos( 1.5707963267948966 ) )  # ~0  <- ~90 degrees  ==  pi / 2

print(math.cos( 3.1415926535897932 ) )  # ~-1 <- ~180 degrees ==  pi

print(math.cos( 4.71238898038469   ) )  # ~0  <- ~270 degrees == -pi * (3 / 2)

print(math.cos( 6.2831853071795850 ) )  # ~1  <- ~360 degrees ==  pi * 2

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print(math.cos( -1.5707963267948966) )  # ~0  <- ~-90 degrees == -pi / 2

import math

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x1 = 0.0            # beginning of calculation in radians

x2 = math.pi / 2    # ending of calculation radians

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dx = math.pi / 9    # calculation step in degrees

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rad = x1

while rad <= x2:

    y = math.cos(rad)

    print("cos(", rad, " rad) = ", y)

    rad += dx

cos( 0.0 rad) =  1.0

cos( 0.3490658503988659 rad) =  0.9396926207859084

cos( 0.6981317007977318 rad) =  0.766044443118978

cos( 1.0471975511965976 rad) =  0.5000000000000001

cos( 1.3962634015954636 rad) =  0.17364817766693041

import math

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def calculate_cos(deg):

    rad = (math.pi / 180) * deg

    return math.cos(rad)

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x1 = 0.0    # beginning of calculation in degrees

x2 = 90.0   # ending of calculation degrees

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dx = 15.0   # calculation step in degrees

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deg = x1

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while deg <= x2:

    y = calculate_cos(deg)

    print("cos(", deg, " deg) = ", y)

    deg += dx

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

import math

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x1 = 0.0         # beginning of cosine chart

x2 = 3 * 3.14    # end of cosine chart

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dx = 3.14 / 4.0  # x axis step

dy = 1.0 / 5.0   # y axis step

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rad = x1

while rad < x2:

    y1 = 0.0

    y2 = math.cos(rad) + 1

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    string = ""

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    y = y1

    while y < y2:

        string += " "

        y += dy

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    print(string, "+")

    rad += dx

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