ASN Function

ASN(real-expression)

Returns the arc sine (inverse sine) of the given expression, in radians. The input must be between -1 and 1.

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Examples

PRINT ASN(0)

Produces 0.

PRINT ASN(1)

Produces approximately 1.570796 (π/2).

PRINT ASN(-1)

Produces approximately -1.570796 (-π/2).

REM Validate a sine identity
angle# = 0.5
PRINT ASN(SIN(angle#))

Produces the original angle (within floating point accuracy).

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Notes

• Argument range: -1 ≤ x ≤ 1. Values outside this range cause an error.
• Return range: -π/2 ≤ result ≤ π/2 radians.
• To convert the result to degrees, multiply by 180 / PI.
• Inverse functions:
  • ACS (arc cosine)
  • ATN (arc tangent)

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See also: SIN · ACS · ATN · TAN