The Exact Value for Tangent of 18 Degrees, tan(18)

This video works to determine the exact value for the tangent of 18 degrees, tan(18). It employs the triple-angle identity, double-angle identity, and the difference identity for tangent. The process writes and solves a polynomial equation whose roots are the exact value for the tangent of 18 degrees and ALSO the tangent of 54 degrees.