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HomertheGenius
The function is differentiable for:
x² - 4 x - 5 ≠ 0
x² - 5 x + x - 5 ≠ 0
x ( x - 5 ) + ( x - 5 ) ≠ 0
( x - 5 ) ( x + 1 ) ≠ 0
x ≠ 5 and x ≠ - 1
Answer: x ∈ R \ { -1, 5 }

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