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.TH SIN 2
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.SH NAME
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sin, cos, tan, asin, acos, atan, atan2 \- trigonometric functions
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.SH SYNOPSIS
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.B #include <u.h>
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.br
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.B #include <libc.h>
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.PP
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.B
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double sin(double x)
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.PP
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.B
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double cos(double x)
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.PP
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.B
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double tan(double x)
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.PP
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.B
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double asin(double x)
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.PP
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.B
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double acos(double x)
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.PP
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.B
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double atan(double x)
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.PP
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.B
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double atan2(double y, double x)
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.SH DESCRIPTION
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.I Sin, cos
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and
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.I tan
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return trigonometric functions of radian arguments.
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The magnitude of the argument should be checked
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by the caller to make sure the result is meaningful.
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.PP
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.I Asin
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returns the arc sine in the range
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\-π/2 to π/2.
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.PP
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.I Acos
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returns the arc cosine in the range
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.PP
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.I Atan
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returns the arc tangent in the range
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\-π/2 to π/2.
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.PP
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.I Atan2
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returns the arc tangent of
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.I y/x
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in the range
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\-π to π.
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.SH SOURCE
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.B /sys/src/libc/port
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.SH SEE ALSO
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.IR intro (2)
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.SH BUGS
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The value of
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.I tan
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for arguments greater than about
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.if t 2\u\s-231\s+2\d
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.if n 2^31
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is garbage.