What is the difference between sin⁻¹ range and cos⁻¹ range?
sin⁻¹ returns angles in [−π/2, π/2]; cos⁻¹ returns angles in [0, π] — different principal branches chosen to keep each single-valued.
sin⁻¹ returns angles in [−π/2, π/2]; cos⁻¹ returns angles in [0, π] — different principal branches chosen to keep each single-valued. A reliable way to keep them apart is to focus on what each one is defined by, not just the similar-sounding words.
Key point
sin⁻¹ range vs cos⁻¹ range
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