@hansconan, the concepts covered in your contribution are too simple. Use of these formula is covered in many other text and video tutorials around the Internet.
GUIDELINE -
Tutorials containing process videos, such as gameplay, content creation and simple on-screen instruction will be rejected.
Tutorials containing substantial instruction in ubiquitous functions (Save, Open, Print, etc.) or basic programming concepts (variables, operators, loops, etc.) will be rejected.
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