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September 21, 2014

September 21, 2014

Posted by **marie darling** on Sunday, April 14, 2013 at 5:33pm.

When do I use +2kpi? Is it only when I'm suppose to "find all solutions"?

I got sin(x)=1/3. Is that correct?

- precalculus -
**Damon**, Sunday, April 14, 2013 at 7:11pm3 cos x = cos x / sin x

trick is that if cos x = 0, that is a solution so

x = pi/2 or x = 3 pi/2 are solutions

as well as when sin x = 1/3

sin^-1(1/3) = 19.5 degrees or .34 radians

or 180 - 19.5 = 160.5 degrees or 2.8 radians

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