the mathematical constant PI
| std::cos | returns the cosine of the given angle |
| std::sin | returns the sine of the given angle |
| std::tan | returns the tangent of the given angle |
| std::asin | returns the arcsine of the given value |
| std::acos | returns the arccosine of the given value |
| std::atan | returns the arctangent of the given value |