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Computer tips

firfox enable backspace:
about:config --> find "browser.backspace_action" --> change 2 to 0.

in c++, arcsine is asin();

at fermilab, the print command is "kprinter"
actually most of the time it doesn't work. so
1. print page to file "xx.pdf";
2. print pdf.
most of the time this way it's successful.

in term command line,
^a to the beginning
^e to the end.
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