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# Plan 9 - man page for sin (plan9 section 2)

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 ```SIN(2) SIN(2) NAME sin, cos, tan, asin, acos, atan, atan2 - trigonometric functions SYNOPSIS #include #include double sin(double x) double cos(double x) double tan(double x) double asin(double x) double acos(double x) double atan(double x) double atan2(double y, double x) DESCRIPTION Sin, cos and tan return trigonometric functions of radian arguments. The magnitude of the argument should be checked by the caller to make sure the result is meaningful. Asin returns the arc sine in the range -n/2 to n/2. Acos returns the arc cosine in the range 0 to n. Atan returns the arc tangent in the range -n/2 to n/2. Atan2 returns the arc tangent of y/x in the range -n to n. SOURCE /sys/src/libc/port SEE ALSO intro(2) BUGS The value of tan for arguments greater than about 2^-31 is garbage. SIN(2)```
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