JenniferSmart1
\[cos^{1}\left(cos\frac{4\pi}{5}\right)\]
since it's within the limits
\[0 \le \theta\le \pi\]
\[\frac{4\pi}{5}\]



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JenniferSmart1
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@satellite73

anonymous
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yes

JenniferSmart1
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cool! Thanks!

anonymous
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yw, you did it not me