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Inverse trigonometric functions
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Learn it sin⁻¹ x and tan⁻¹ x give angles from −90° to 90° (−π/2 to π/2); cos⁻¹ x gives angles from 0° to 180° (0 to π). These are the principal values.
Example: Evaluate cos⁻¹(−1/2).
- The angle between 0° and 180° whose cosine is −1/2.
- 120° (2π/3).
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