[VA] SRC#004- Fun with Sexagesimal Trigs

[Albert Chan]

Prove E = -1:

This one is easy. Just do the first term, using shorthand c(#) = c# = cos(#°)

(2 c4 - 1/c4) = (2 c4^2 - 1) / c4 = c8 / c4

Numerator and denominator for everything cancelled out, except c(2^26)/c(4)

c(2^26) = c(2^26 mod 360) = c184 = -c4

-> E = -c4/c4 = -1