When we expand it we get...Tan π/4 + Tan x / 1- Tan π/4 × Tanx / Tan π/4 - Tanx / 1+ Tanπ/4 × Tan x Which implies 1 + Tanx / 1- Tanx / 1- Tanx / 1+ Tanx Which equals (1+Tanx)2/ (1-Tanx)2Equals (1+Tanx / 1- Tanx)2
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