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 Jul25 awarded Popular Question Jul2 awarded Curious Mar8 awarded Yearling May27 awarded Nice Question May5 comment Customize startup @Mr. Wizard in fact, the documentation says: A notebook with the option setting Saveable->False can always be saved using the Save As menu item, but does not respond to Save and does not prompt for saving when it is closed. May5 revised Customize startup added 46 characters in body May5 comment Customize startup @Mr.Wizard Mathematica doesn't prompt me to do save the file on closing but when i open this notebook, it is in fullscreen mode and with the right magnification,as desired and what do you exactly mean with "change the properties to maximized". May5 revised Customize startup added 15 characters in body May5 awarded Commentator May5 comment Customize startup Selecting "Full" under Notebook Options/Windows properties/Windows size does nothing but the magnification worked well. May5 asked Customize startup Apr19 awarded Nice Question Mar28 comment Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ @Jens thank you very much, Mathematica seems a tricky tool for proving theorems. Mar28 accepted Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ Mar28 comment Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ @Jens You are the only one that understood me. Your approach is good but not fully correct since Tan[Pi/x]>=Pi/x is not true for all x > 1. I tried Resolve[ForAll[x, x > 1 && (0 < x < \[Pi]/2 \[Implies] Tan[x] > x), f'[x] >= 0] ] but didn't work. Maybe i'm asking too much from Mathematica. Can you make this work please? Mar28 comment Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ This is indeed a neat solution to my problem, but my question wasn't too clear, i edited it. Mar28 revised Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ added 335 characters in body Mar28 awarded Critic Mar28 asked Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ Mar27 accepted FindInstance with a Diophantine equation seems to go on forever