math: Add trigonometric functions and some angle helper functions

This commit adds these new template functions in the `math` namespace:

math.Acos
math.Asin
math.Atan
math.Atan2
math.Cos
math.Pi
math.Sin
math.Tan
math.ToDegrees
math.ToRadians

Co-authored-by: Joe Mooring <joe@mooring.com>

docs/content/en/functions/math/Acos.md

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+---
+title: math.Acos
+description: Returns the arccosine, in radians, of the given number.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/Asin
+    - functions/math/Atan
+    - functions/math/Atan2
+    - functions/math/Pi
+    - functions/math/Sin
+    - functions/math/Cos
+    - functions/math/Tan
+  returnType: float64
+  signatures: [math.Acos VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.Acos 1 }} → 0
+```

docs/content/en/functions/math/Asin.md

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+---
+title: math.Asin
+description: Returns the arcsine, in radians, of the given number.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/Acos
+    - functions/math/Atan
+    - functions/math/Atan2
+    - functions/math/Pi
+    - functions/math/Sin
+    - functions/math/Cos
+    - functions/math/Tan
+  returnType: float64
+  signatures: [math.Asin VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.Asin 1 }} → 1.5707963267948966
+```

docs/content/en/functions/math/Atan.md

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+---
+title: math.Atan
+description: Returns the arctangent, in radians, of the given number.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/Atan2
+    - functions/math/Asin
+    - functions/math/Acos
+    - functions/math/Pi
+    - functions/math/Sin
+    - functions/math/Cos
+    - functions/math/Tan
+  returnType: float64
+  signatures: [math.Atan VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.Atan 1 }} → 0.7853981633974483
+```

docs/content/en/functions/math/Atan2.md

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+---
+title: math.Atan2
+description: Returns the arctangent, in radians, of the given number pair, determining the correct quadrant from their signs.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/Atan
+    - functions/math/Asin
+    - functions/math/Acos
+    - functions/math/Pi
+    - functions/math/Sin
+    - functions/math/Cos
+    - functions/math/Tan
+  returnType: float64
+  signatures: [math.Atan2 VALUE VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.Atan2 1 2 }} → 0.4636476090008061
+```

docs/content/en/functions/math/Cos.md

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+---
+title: math.Cos
+description: Returns the cosine of the given radian number.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/Pi
+    - functions/math/Sin
+    - functions/math/Tan
+    - functions/math/Asin
+    - functions/math/Acos
+    - functions/math/Atan
+    - functions/math/Atan2
+  returnType: float64
+  signatures: [math.Cos VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.Cos 1 }} → 0.5403023058681398
+```

docs/content/en/functions/math/Pi.md

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+---
+title: math.Pi
+description: Returns the mathematical constant pi.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/Sin
+    - functions/math/Cos
+    - functions/math/Tan
+    - functions/math/Asin
+    - functions/math/Acos
+    - functions/math/Atan
+    - functions/math/Atan2
+  returnType: float64
+  signatures: [math.Pi]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.Pi }} → 3.141592653589793
+```

docs/content/en/functions/math/Sin.md

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+---
+title: math.Sin
+description: Returns the sine of the given radian number.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/Pi
+    - functions/math/Cos
+    - functions/math/Tan
+    - functions/math/Asin
+    - functions/math/Acos
+    - functions/math/Atan
+    - functions/math/Atan2
+  returnType: float64
+  signatures: [math.Sin VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.Sin 1 }} → 0.8414709848078965
+```

docs/content/en/functions/math/Tan.md

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+---
+title: math.Tan
+description: Returns the tangent of the given radian number.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/Pi
+    - functions/math/Sin
+    - functions/math/Cos
+    - functions/math/Asin
+    - functions/math/Acos
+    - functions/math/Atan
+    - functions/math/Atan2
+  returnType: float64
+  signatures: [math.Tan VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.Tan 1 }} → 1.557407724654902
+```

docs/content/en/functions/math/ToDegrees.md

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+---
+title: math.ToDegrees
+description: ToDegrees converts radians into degrees.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/ToRadians
+    - functions/math/Pi
+  returnType: float64
+  signatures: [math.ToDegrees VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.ToDegrees 1.5707963267948966 }} → 90
+```

docs/content/en/functions/math/ToRadians.md

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+---
+title: math.ToRadians
+description: ToRadians converts degrees into radians.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/math/ToDegrees
+    - functions/math/Pi
+  returnType: float64
+  signatures: [math.ToRadians VALUE]
+---
+
+{{< new-in 0.130.0 >}}
+
+```go-html-template
+{{ math.ToRadians 90 }} → 1.5707963267948966
+```