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OpenStudy (anonymous):
The value of cos^2 (a)+ cos^2 (a+120deg) + cos^2 (a-120) is ??????
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OpenStudy (anonymous):
\[\frac{3}{2} \]
OpenStudy (anonymous):
Used Mathematica to evaluate the expression:\[\text{Cos}[a]^2+\text{Sin}[a-30 {}^{\circ}]^2+\text{Sin}[a+30 {}^{\circ}]^2\text{//}\text{FullSimplify} \]Thank you for the medal.
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