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posted by Cynthia on Sunday, August 12, 2012 at 3:13pm.
Find the exact value of tan2(Beta) if sin(Beta) = 5/13 (Beta in Quadrant II)
sin x = 5/13 so tan x = -5/12 tan 2x = 2tan x/(1 - tan^2 x) = 2(-5/12)/(1 - 25/144) = -120/119
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