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OpenStudy (anonymous):
what values for theta(0<=theta<=2pi) satisfy the equation? 4cos theta + 1= 2cos theta
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OpenStudy (rulnick):
Solve for cos theta to get: cos theta = -1/2 Do you know which angles have a cosine equal to -1/2?
OpenStudy (anonymous):
i got that part the -1/2 but am stuck after that?
OpenStudy (anonymous):
is it 2pi/3 and 4pi/3
OpenStudy (rulnick):
The angles that have cosine -1/2 are 120 degrees and 240 degrees, or 2pi/3 and 4pi/3.
OpenStudy (rulnick):
Yes!
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OpenStudy (anonymous):
oh an 0
OpenStudy (anonymous):
thank you :)
OpenStudy (rulnick):
welcome
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