Trigonometry
posted by Cynthia .
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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