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September 1, 2014

Posted by **lina** on Tuesday, April 3, 2012 at 4:16pm.

cos x/3=1/2

- pre-calculus -
**mae**, Tuesday, April 3, 2012 at 4:26pm1.5

- pre-calculus -
**Steve**, Tuesday, April 3, 2012 at 5:34pmcos(pi/3) = 1/2

cos(5pi/3) = 1/2

so, x = pi or 5pi

- pre-calculus - PS -
**Steve**, Tuesday, April 3, 2012 at 5:35pmoops only in [0,pi], so x=pi

However, you gave the interval as (0,pi), which excludes pi, so no solution.

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