Inverse trigonometric sine of x.

In mathematics, this may be written as \(\arcsin x\) or \(\sin^{-1}x\).

The returned value is in the interval \([-\frac14 \tau, \frac14\tau]\), and NA for the values of x that lie outside the interval [-1, 1]. This function is the inverse of sin() in the sense that sin(arcsin(x)) == x for all x in the interval [-1, 1].

See also

  • sin(x) – the trigonometric sine function;

  • arccos(x) – the inverse cosine function.