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Special Type of Function

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Estimated time: 4 minutes
Maharashtra State Board: Class 12

Key points: Special Type of Function

Function Type Definition / Formula Domain Range
Inverse Function f⁻¹ exists if f is bijective,
f⁻¹(y) = x ⇔ f(x) = y
Domain(f⁻¹) = Range(f) Range(f⁻¹) = Domain(f)
Modulus (Absolute Value) f(x) = |x| R or (-∞, ∞) [0, ∞)
Signum Function sign(x) = { 1, if x > 0
0, if x = 0
−1, if x < 0 }
R {−1, 0, 1}
Greatest Integer (Step Function) f(x) = [x] (greatest integer ≤ x) R I (integers)
Fractional Part Function f(x) = {x} = x − [x] R [0, 1)
Even Function f(−x) = f(x) Depends Depends
Odd Function f(−x) = −f(x) Depends Depends
Periodic Function f(x + T) = f(x), T = period Depends Depends
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