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Card 6 / 8:
angle of rotation
an acute angle formed by a set of axes rotated from the Cartesian plane where, if cot ( 2 θ ) > 0 , then θ is between ( 0° , 45° ) ; if cot ( 2 θ ) < 0 , then θ is between ( 45° , 90° ) ; and if cot ( 2 θ ) = 0 , then θ = 45°
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