asin, asinf, asinl

Article
04/28/2015

Calculates the arcsine.

double asin( 
   double x 
);
float asin(
   float x
);  // C++ only
long double asin(
   long double x
);  // C++ only
float asinf ( 
   float x 
);
long double asinl(
   long double x
);

Parameters

x
Value whose arcsine is to be calculated.

Return Value

The asin function returns the arcsine (the inverse sine function) of x in the range –π/2 to π/2 radians.

By default, if x is less than –1 or greater than 1, asin returns an indefinite.

Input	SEH Exception	Matherr Exception
± ∞	INVALID	_DOMAIN
± QNAN,IND	none	_DOMAIN
\|x\|>1	INVALID	_DOMAIN

Remarks

Because C++ allows overloading, you can call overloads of asin with float and long double values. In a C program, asin always takes and returns a double.

Requirements

Routine	Required header
asin, asinf, asinl	<math.h>

Example

For more information, see acos, acosf, acosl.

.NET Framework Equivalent

System::Math::Asin

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