! Aware to Perl: cos EXPR

cos EXPR

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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] ) }

Source: Perl builtin functions
Copyright: Larry Wall, et al.

(Corrections, notes, and links courtesy of RocketAware.com)

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