[Term Entry] C++ Math Functions: `sin()`

[SSwiniarski]

Reason/inspiration (optional)

Under cpp/concepts/math-functions/terms/, create a new term entry for the sin() function.

• In the terms/ folder, make a new folder called sin
• Inside the sin folder, create a new markdown file called sin.md
• Inside the file, be sure to include a "Syntax" section with a ```pseudo code snippet.
• Let's include an "Example" section with a ```cpp code snippet.
• Lastly, let's include a "Codebyte Example" with a runnable ```codebyte/cpp

Please refer to the entry templates, content standards, and markdown style guide when working on the PR for this issue.

Entry Type (select all that apply)

New Term for Existing Concept Entry

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For Maintainers

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[Yash-Var]

@SSwiniarski i will work on this issue ...

[SSwiniarski]

@Yash-Var I assigned you to this issue. Thanks for contributing!

[Yash-Var]

@Dusch4593 @SSwiniarski i have made a pr review it and guide me if there is any mistake

[Yash-Var]

@SSwiniarski check my new changes ...

[Yash-Var]

@SSwiniarski check my new changes ...