Question: Describe the error. tan (x - / 4) = tan x - tan(x / 4) / 1 - tan x tan( / 4) =

Describe the error. tan (x - π / 4) = tan x - tan(x / 4) / 1 - tan x tan(π / 4)
= tan x - 1 / 1 - tan x
= - 1

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