buch/chapters/030-geometrie/trigo/3.m


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format long

s15 = sqrt((2-sqrt(3))/4)
c15 = sqrt((2+sqrt(3))/4)

s36 = sqrt((5-sqrt(5))/8)
c36 = sqrt((3+sqrt(5))/8)

s18 = sqrt(1/2-c36/2)
c18 = sqrt(1/2+c36/2)

s3 = s18 * c15 - c18 * s15
c3 = c18 * c15 + s18 * s15