[Term Entry] Go Math Functions: .Tan() (#2535)

* Create Cos term for golang math function

* Create Tan term for golang math function and updated the cos.md and tags.md

* Delete tan.md

delete tan.md from the PR of cos.md

* updated cos.md

* Create Tan term for golang math function

* Merged conflicts in cos.md

* Removed file from PR and updated the tan.md with the reviewed changes

* Removed cos file from PR

* formatted the tan.md

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Co-authored-by: SSwiniarski <86081858+SSwiniarski@users.noreply.github.com>

Author: 4hbab

content/go/concepts/math-functions/terms/tan/tan.md

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+---
+Title: 'Tan()'
+Description: 'Returns the tangent of the given angle.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Math'
+  - 'Trigonometry'
+  - 'Functions'
+CatalogContent:
+  - 'learn-go'
+  - 'paths/computer-science'
+---
+
+The **`Tan()`** function returns the tangent of an angle given in radians. The `math` library must be imported in order to use this function.
+
+## Syntax
+
+```pseudo
+result := math.Tan(angle)
+```
+
+Where `result` is the tangent value of `angle`, returned as a float, except under the following circumstances:
+
+- The result of `Tan(-Inf)` is `NaN`
+- The result of `Tan(+Inf)` is `NaN`
+- The result of `Tan(NaN)` is `NaN`
+
+## Example
+
+The following calculates the tangent of `angle` and prints out the result:
+
+```go
+package main
+
+import (
+  "fmt"
+  "math"
+)
+
+func main() {
+  angle := math.Pi / 6
+  tangent := math.Tan(angle)
+  fmt.Printf("%.1f\n", tangent)
+}
+```
+
+The output will be:
+
+```shell
+0.6
+```
+
+## Codebyte Example
+
+The following example is runnable and shows how the `Tan()` function handles infinite values.
+
+```codebyte/golang
+package main
+
+import (
+  "fmt"
+  "math"
+)
+
+func main() {
+  positiveInfinity := math.Inf(1)
+  negativeInfinity := math.Inf(-1)
+
+  tanPositiveInf := math.Tan(positiveInfinity)
+  tanNegativeInf := math.Tan(negativeInfinity)
+
+  fmt.Printf("The tangent of positive infinity: %f\n", tanPositiveInf)
+  fmt.Printf("The tangent of negative infinity: %f\n", tanNegativeInf)
+}
+```