Inverse Trigonometric Functions
ICSE · Class 12 · Mathematics
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The range of sin⁻¹ (principal value branch) is:
The range of cos⁻¹ (principal value branch) is:
The domain of tan⁻¹ is:
Find the principal value of sin⁻¹(1/√2).
Sample Questions
Find the principal value of cos⁻¹(1/2).
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π/3
cos(π/3) = 1/2 and π/3 ∈ [0, π]. So cos⁻¹(1/2) = π/3.
Find the principal value of tan⁻¹(1).
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π/4
tan(π/4) = 1 and π/4 ∈ (−π/2, π/2). So tan⁻¹(1) = π/4.
Find sin⁻¹(−1/2).
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−π/6
sin⁻¹(−1/2) = −sin⁻¹(1/2) = −π/6. Using the odd property.
Find cos⁻¹(−1/2).
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2π/3
cos⁻¹(−1/2) = π − cos⁻¹(1/2) = π − π/3 = 2π/3.
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