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January 29, 2015

January 29, 2015

Posted by **Anonymous** on Monday, February 1, 2010 at 9:54pm.

- trig -
**drwls**, Monday, February 1, 2010 at 11:36pmI do not understand your notation, è=2ð/3.

Do you mean theta = 2 pi/3?

The sine of 2 pi/3 is the same as the sine of pi/3, which is (sqrt3)/2

The cosine of 2 pi/3 has the same absolute value as cos pi/3 (1/2), but has opposite sign

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