Evaluate each value as a trigonometric function of an angle in Quadrant 1.

#1 cos (27pi/8)

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  1. 27 pi/8 = 3 pi + 3 pi/8
    that is 180 degrees + 67.5 degrees
    that is in quadrant 3 where cos is negative
    -cos 3 pi/8 radians
    -cos 67.5 degrees

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