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September 30, 2014

September 30, 2014

Posted by **mrkkn** on Friday, July 16, 2010 at 7:49am.

- trig -
**Reiny**, Friday, July 16, 2010 at 8:13amFrom the ratios of sides of the 30-60-90 triangle you know that if

sinØ= +1/2 , then Ø = 30°

Also in the 4th quadrant, both the sine and tangent and of course their reciprocals are negative, the cosine is positive.

so

sinØ = -1/2 csc‚ = -2

cosØ = √3/2 secØ = 2/√3

tanØ = - 1/√3 cotØ = -√3

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