eq b $. Instead, note that $ rac{a + b}{a - b} + rac{a - b}{a + b} = rac{2(a^2 + b^2)}{a^2 - b^2} $. Let $ a = e^{i heta} $, $ b = e^{i\phi} $, then compute $ S = rac{2(e^{2i heta} + e^{2i\phi})}{e^{2i heta} - e^{2i\phi}} $. Multiply numerator and denominator by $ e^{-i heta} \overline{e^{i heta}} $:

Sat, 02 May 2026 10:54:33 +0000

Content under review