Evaluate arcsin, arccos, arctan in degrees and radians, with exact values at special inputs.
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Why it works
Inverse trig functions undo their trig counterparts on restricted (principal) domains: arcsin/arccos return [−90°, 90°]/[0°, 180°] and need |x| ≤ 1; arctan accepts any real x and returns (−90°, 90°). These principal values are the building blocks for solving trig equations.
