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12 e: A more efficient way, using the properties of cis.(cis2θ - 1)/(cis2θ + 1) = cisθ(cisθ - cis(-θ))/cisθ(cisθ + cis(-θ)) = 2isin2θ/2cosθ = itanθ
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12 e: A more efficient way, using the properties of cis.
(cis2θ - 1)/(cis2θ + 1) = cisθ(cisθ - cis(-θ))/cisθ(cisθ + cis(-θ)) = 2isin2θ/2cosθ = itanθ