Kenneth S. answered • 05/22/17
Tutor
4.8
(62)
Let's cut to the chase: I know this subject & how to teach YOU
Equivalent to cos (2θ) = 1/3
2cos2θ - 1 = 1/3
Can you finish the job, now?
Kenneth S.
2.5261 radians = 2.5261(180/pi) degrees = 144.738 degrees
I multiplied this by two and took the cosine of that, and got 0.33331 which is pretty close to 1/3, so YES, your answer looks good.
You can check your others in a similar way.
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05/23/17
J H.
05/22/17