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2014-04-02T21:50:40+03:00
2014-04-02T21:52:15+03:00
Cos60=1/2
cos30= \sqrt{3} /2
sin60= \sqrt{3} /2
sin30=1/2
cos60=1/2
cos30= \sqrt{3} /2
sin60= \sqrt{3} /2
sin30=1/2