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tan(660-360) - sin(900-2.360) +cos (390-360)
tan300 - sin180 + cos 30
-tan(360-300)-0 +1/2V3
-tan60+1/2V3
-1/3V3 + 1/2 V3
sin 900=(2.360+180)=sin 180=0
cos(-390)=cos 390=cos(1.360+30)=cos 30=1/2√3
tan 660-sin 900+cos(-390)=√3-0+1/2√3=1,5√3