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sin 120 = 0,866
cos 225 = -0,707
cos 30 = 0,866
-1 + 0,866 + -0,707 - 0,866 = -1,707
= -1 + sin (180-60) + cos(180+ 45) - 1/2√3
= -1 + 1/2√3 - 1/2√2 - 1/2√3
= -1+ √3 - 1/2√2