1-
sen1.sen3.sen 5....sen87.sen89=sen1.sen3.sen 5 ....sen89.sen 2
.sen 4 .sen 6 ....sen 88/sen 2.sen 4 .sen 6 ...sen 88=
sen 1. sen 89 .sen 2 sen 88 .sen3 .sen 87....sen 44. sen 46
.sen 45/sen2 .sen 4 .sen6 ....sen88=
sen1cos1.sen2.cos2.sen3.cos3...sen44.cos44.sen45/sen2. sen 4.
sen6....sen88=
como sen 2a=2sena.cosa
concluimos = (1/2)^44.sen 45= (1/2)^44,5 logo
n=44,5
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