- What is the inverse function of Tan ( 1/Tanx) equal to and how do I prove it?

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How can space be filled with Photons if photons don't have a volume? What is space time fabric and how does it exist? How do I prove (with calculus) m=-b/(2a) (the formula for finding maxs and mins)? I'll tried to figure this out but can't seem to get it. If someone could please help.? How many valence electrons does Ne have?