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2014-04-19T18:23:02+07:00
Tan 660 = (2×360-60) = tan 60= √3
sin 900 = (2×360+180) = sin 180 = 0
cos (-390) = (1×360+30) = cos -30 = -√3/2

√3 - 0 + -√3/2 =  \frac{2 \sqrt{3}- \sqrt{3}  }{2}
 \frac{1}{2}  \sqrt{3}