![\tan [ \frac { 1 } { 2 } \cos ^ { - 1 } ( \frac { 2 } { \sqrt { 5 } } ) ]](https://tex.z-dn.net/?f=%5Ctan+%5B+%5Cfrac+%7B+1+%7D+%7B+2+%7D+%5Ccos+%5E+%7B+-+1+%7D+%28+%5Cfrac+%7B+2+%7D+%7B+%5Csqrt+%7B+5+%7D+%7D+%29+%5D "\tan [ \frac { 1 } { 2 } \cos ^ { - 1 } ( \frac { 2 } { \sqrt { 5 } } ) ]")
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\tan [ \frac { 1 } { 2 } \cos ^ { - 1 } ( \frac { 2 } { \sqrt { 5 } } ) ]
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Answer:
arccos(2/sqrt(5))=26.56,
tan(13.28)=0.236
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