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July 27, 2015

Homework Help: trigonometry

Posted by Yulieth on Sunday, November 20, 2011 at 7:18pm.

tanθ= -2sqrt10/3 and π/2<θ< π find
a. cos(-θ)
b. cos(11π/6 - θ)
c.sin2θ
d.tanθ/2
can some please explain to me how to solve these questions? thanks

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