Posted by **Rachal** on Sunday, May 15, 2011 at 1:33pm.

Find all solutions of the equation in the interval [0,2pi) .

cos(theta)=0.7125

If there is more than one solution, separate them with commas.

Do not round any intermediate computations, and round your answer(s) to the nearest hundredth.

Can someone help me with this? Thanks

- Trig -
**bobpursley**, Sunday, May 15, 2011 at 2:42pm
my first thought is what unit for angles? degrees, radians? I have never liked computer instruction, they demand precision to the hundreth place, but don't specify the units. It makes a difference.

Cosine is positive in first, fourth quadrant.

arccos.7125=44.56 __degrees__

so in the fourth quadrant, it is

360-44.56 degrees.

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