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## Recipe 2.11 Calculating More Trigonometric Functions## 2.11.1 ProblemYou want to calculate values for trigonometric functions like sine, tangent, or arc-cosine. ## 2.11.2 Solution
Perl provides only
sub tan { my $theta = shift; return sin($theta)/cos($theta); } The POSIX module provides a wider range of trig functions: use POSIX; $y = acos(3.7); The standard Math::Trig module provides a complete set of functions and supports operations on or resulting in complex numbers: use Math::Trig; $y = acos(3.7); ## 2.11.3 DiscussionThe eval { $y = tan($pi/2); } or return undef; ## 2.11.4 See AlsoThe |

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