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January 30, 2015

January 30, 2015

Posted by **Anonymous** on Wednesday, July 9, 2014 at 11:41pm.

tan 2 theta; cos theta=7/25, theta in quadrant I

- trig -
**Steve**, Wednesday, July 9, 2014 at 11:52pmIf cosθ = 7/25 in QI, then sinθ = 24/25

That means tanθ = 24/7, and you (ahem) know that

tan2θ = 2tanθ/(1-tan^2 θ)

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