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December 21, 2014

December 21, 2014

Posted by **lindsay** on Wednesday, May 2, 2012 at 4:15pm.

5tan^2 y +5 tan y = 2 sec^2 y

- trigonometry -
**Steve**, Wednesday, May 2, 2012 at 4:43pmrecalling that sec^2 = 1+tan^2, rearrange things to have

3tan^2 y + 5 tan y - 2 = 0

(3tan y - 1)(tan y + 2) = 0

tan y = 1/3 or -2

tan is positive in QI and QIII, so tany = 1/3 means that

y = 18.43° or 198.43°

tany = -2 means

y = 116.57° or 296.57°

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