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Ruby documentation welcome to the official ruby programming language documentation Returns the arc cosine of the given. Getting started new to ruby

Start with our getting started guide Returns the tangent of the given argument Core classes and modules explore the essential classes and modules

Identical regexp can or cannot run in linear time depending on your ruby binary

Neither forward nor backward compatibility is guaranteed about the return value of this method. Ruby code can raise exceptions Most often, a raised exception is meant to alert the running program that an unusual (i.e., exceptional) situation has arisen, and may need to be handled. Class \struct provides a convenient way to create a simple class that can store and fetch values

The first argument, a string, is the name of th Miniruby is a version of ruby which has no external dependencies and lacks certain features It can be useful in ruby development because it allows for faster build times. Ruby was first developed by matz (yukihiro matsumoto) in 1993, and is now developed as open source

It runs on multiple platforms and is used all over the world especially for web development.

Each of these methods takes optional argument format, which has zero or more embedded format specifications (see below). Please see the github releases for further details This version is a last version of normal maintenance for ruby 3.2 series We will fix only security issues for ruby 3.2 series until end of march 2026

Please consider upgrading to ruby 3.3 or 3.4 series This system is hosting the development of ruby language and its related projects You must register your account and activate it via an email before reporting issues. What’s here trigonometric functions ::cos

Returns the cosine of the given argument

Returns the sine of the given argument

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