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HP-UX Reference > Ttand(3M)HP-UX 11i Version 3: February 2007 |
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NAMEtand(), tandf(), tandl(), tandw(), tandq() — tangent functions of an argument specified in degrees DESCRIPTIONtand() returns the tangent of x (x specified in degrees). On PA-RISC systems, tand() may lose accuracy when x is far from zero. tandf() is a float version of tand(); it takes a float argument and returns a float result. USAGETo use these functions compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. To use (for Integrity servers) tandw() or tandq(), compile also with the -fpwidetypes option. To use any of these functions, make sure your program includes <math.h>, and link in the math library by specifying -lm on the compiler or linker command line. For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site: http://www.hp.com/go/fp. RETURN VALUEtand(±0) returns ±0. If x is ±INFINITY, tand() returns NaN and raises the invalid exception. If x is NaN, tand() returns NaN. SEE ALSOacosd(3M), asind(3M), atand(3M), atan2d(3M), cosd(3M), sincosd(3M), sind(3M), tan(3M), math(5). |
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