Posted by Jack on Tuesday, January 11, 2011 at 2:43pm.
(0.588, 0.809).
cos(theta) = 0.588,
theta = 53.98 deg.
2theta = 2 * 53.98 = 107.98 deg.
cos107.98 = -0.309,
sin107.98 = 0.951.
(-0.309, 0.951).
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