XPATH math:sin

sin

Signature

 xsd:double  sin (xsd:double)

The result is the sine of $θ (which is treated as an angle in radians) as defined in the [IEEE 754-2008] specification of the sin function applied to 64-bit binary floating point values.

This function is equivalent to as math:sin.

ASK {FILTER(SIN("0.0e0) = "0.0e0"^^xsd:double)}
ASK {FILTER(SIN("-0.0e0) = "-0.0e0"^^xsd:double)}
ASK {FILTER(SIN(PI() / 2) > "0.99"^^xsd:double)} #Approximate
ASK {FILTER(SIN(PI() / 2) =< "1.00"^^xsd:double)}
ASK {FILTER(SIN(- (PI()) / 2) < "-0.99"^^xsd:double)} #Approximate
ASK {FILTER(SIN(- (PI()) / 2) >= "-1.00"^^xsd:double)}
ASK {FILTER(SIN(PI()) > "-0.01"^^xsd:double)}  #Approximate
ASK {FILTER(SIN(PI()) < "0.01"^^xsd:double)}
ASK {FILTER(SIN("-2.0e0) = "NaN"^^xsd:double)}
ASK {FILTER(SIN("NaN"^^xsd:double) = "NaN"^^xsd:double)}
ASK {FILTER(SIN("INF"^^xsd:double) = "NaN"^^xsd:double)}
ASK {FILTER(SIN("-INF"^^xsd:double) = "NaN"^^xsd:double)} 

Should return true

SIN() called without a variable/value should be a parse error.

SIN() called with a numeric as the first ($x parameter) should have that cast to xsd:double.

TODO

Error values, is the approximate to lenient? double check the standards.