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def definition def or abbrev

coshRemainder

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formal statement (Lean)

 158def coshRemainder (x : ℝ) : ℝ := Real.cosh x - 1 - x ^ 2 / 2

proof body

Definition body.

 159
 160/-- The cosh remainder is non-negative for all `x` (because
 161    `cosh x ≥ 1 + x²/2` — a Taylor lower bound). -/

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