Explicit Trigonometry: Day 21–

Back to Day 11–20 

For completeness, we record the following.

These expressions should complement the description of cos(π/23) as each f (e^{2kπi/11}) is a ℤ-linear combination of cos(2kπ/11) and i sin(2kπ/11) = ± i √( 1 - cos(4kπ/11) )/√2.

Again, let me note the following.

Day 1–5 Day 6–10 Day 11–20 Day 21– (here) 

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