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#include <math.h>float asinf(float arg);double asin(double arg); long double asinl(long double arg);
asinf( ) and asinl( ) were added by C99.
The asin( ) family of functions returns the arc sine of arg. The argument must be in the range –1 to 1; otherwise, a domain error will occur.
Related functions are acos( ), atan( ), atan2( ), sin( ), cos( ), tan( ), sinh( ), cosh( ), and tanh( ).
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