cos
Examples:
cos-EXPR
cos
Description:
Returns the cosine of EXPR (expressed in radians). If EXPR is omitted,
takes cosine of $_.
For the inverse cosine operation, you may use the Math::Trig::acos()
function, or use this relation:
sub acos { atan2( sqrt(1 - $_[0] * $_[0]), $_[0] ) }
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