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October 20, 2014

October 20, 2014

Posted by **Dave** on Monday, May 3, 2010 at 1:06am.

Find tan (s + t) given that sin s = 1/4, with s in quadrant 2, and sin t = -1/2, with t in quadrant 4.

- Trig -
**Reiny**, Monday, May 3, 2010 at 1:27amsin s = 1/4 and s in II, ---> tan s = -1/√15

sin t = -1/2, and t in IV ---> tan t = -1/√3

tan(s+t) = (tans + tant)/(1 - tanstant)

= (-1/√15 - 1/√3)/(1 - 1/√45)

I will let you finish the arithmetic.

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