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December 22, 2014

December 22, 2014

Posted by **Cynthia** on Sunday, August 12, 2012 at 3:13pm.

- Trigonometry -
**Steve**, Sunday, August 12, 2012 at 3:25pmsin 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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