math
posted by Jack .
On the unit circle the coordinates of P(theta) are (0.588, 0.809). Find the coordinates of P(2theta). Please help.

math 
Henry
(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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