Noun
the inverse function of the sine; the angle that has a sine equal to a given number
Source: WordNetIf θ measures elevation from the reference plane instead of inclination from the zenith the arccos above becomes an arcsin, and the cos θ and sin θ below become switched. Source: Internet
The principal inverses are usually defined as: : The notations sin −1 and cos −1 are often used for arcsin and arccos, etc. When this notation is used, the inverse functions could be confused with the multiplicative inverses of the functions. Source: Internet
Later, the system was further improved by use of an arcsine-based modulator that included a 1-0.52E term in the denominator of the arcsin generator equation. Source: Internet
Newton himself used an arcsin series to compute a 15 digit approximation of in 1665 or 1666, later writing "I am ashamed to tell you to how many figures I carried these computations, having no other business at the time." Source: Internet