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OpenStudy (anonymous):
help!!! PRE CAL
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OpenStudy (anonymous):
OpenStudy (kainui):
\[2\cos \theta+1=0\] Solve for theta algebraically. When you get to cosine, just use arccosine on both sides to have theta by itself.
OpenStudy (cwrw238):
2 cos theta + 1 = 0 2cos theta = - 1 cos theta = -1/2 arcos 1/2 = pi/3 negative cosines are in second and 3rd quadrants
OpenStudy (anonymous):
whats the answer?
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