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# Right-Triangle Trigonometry

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$ABCD$ is a regular tetrahedron (right triangular pyramid). If $M$ is the midpoint of $\overline{CD}$, then what is $\cos \angle AMB$?

Apr 29, 2021

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See my answer here  :

https://web2.0calc.com/questions/a-couple-of-questions

Apr 29, 2021