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Inverse Trigonometric Functions

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Estimated time: 6 minutes
Maharashtra State Board: Class 12

Key Points: Domain and Range of Inverse Trigonometric Functions

Function Domain Range (Principal Value)
sin⁻¹x −1 ≤ x ≤ 1 −π/2 ≤ y ≤ π/2
cos⁻¹x −1 ≤ x ≤ 1 0 ≤ y ≤ π
tan⁻¹x (−∞, ∞) −π/2 < y < π/2
cosec⁻¹x (−∞, −1] ∪ [1, ∞) −π/2 ≤ y ≤ π/2, y ≠ 0
sec⁻¹x (−∞, −1] ∪ [1, ∞) 0 ≤ y ≤ π, y ≠ π/2
cot⁻¹x (−∞, ∞) 0 < y < π
Maharashtra State Board: Class 12

Formula: Inverse Trigonometric Function

Direct Identities

  • sin⁻¹(sin θ) = θ, if −π/2 ≤ θ ≤ π/2
  • cos⁻¹(cos θ) = θ, if 0 ≤ θ ≤ π
  • tan⁻¹(tan θ) = θ, if −π/2 < θ < π/2

Inverse Identities

  • sin(sin⁻¹x) = x, if −1 ≤ x ≤ 1
  • cos(cos⁻¹x) = x, if −1 ≤ x ≤ 1
  • tan(tan⁻¹x) = x, for all real x

Other Important Ones

  • sec⁻¹(sec θ) = θ, if 0 ≤ θ ≤ π, θ ≠ π/2
  • cosec⁻¹(cosec θ) = θ, if −π/2 ≤ θ ≤ π/2, θ ≠ 0
  • cot⁻¹(cot θ) = θ, if 0 < θ < π

Shaalaa.com | Inverse Trigonometry Functions part 2 (Natural domain Range)

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