A mathematical function that finds the angle whose sine is a given number; the inverse or opposite operation of the sine function.
Abbreviation of 'arc sine,' from 'arc' (in trigonometry, referring to the arc of a circle) + 'sine' (the trigonometric ratio); terminology emerged in 18th-century mathematics.
In trigonometry, if sine gives you a ratio from an angle, arcsin does the reverse—it's like mathematical backwards-thinking, and it's essential for solving real-world problems in engineering and physics.
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