If cosx=-3/5 and pi<x<3pi/2, find tan2x

I got tan2x=-16/7

Is my answer right? or is it tan2x=-24/7?

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- April 9th 2009, 11:24 AMskeske1234Trig Angles tan2x
If cosx=-3/5 and pi<x<3pi/2, find tan2x

I got tan2x=-16/7

Is my answer right? or is it tan2x=-24/7? - April 9th 2009, 12:03 PMmasters