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perlfunc:cos

by gods
on Aug 24, 1999 at 22:43 UTC ( #341=perlfunc: print w/replies, xml ) Need Help??

cos

See the current Perl documentation for cos.

Here is our local, out-dated (pre-5.6) version:


cos - cosine function



cos EXPR



Returns the cosine of EXPR (expressed in radians). If EXPR is omitted, takes cosine of $_.

For the inverse cosine operation, you may use the POSIX::acos() function, or use this relation:

    sub acos { atan2( sqrt(1 - $_[0] * $_[0]), $_[0] ) }

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