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sin60*tg30-2*cos60*ctg60

Răspuns :

sin60=radical3/2
tg30=sin30/cos30=1/2:radical3/2=1/radical3
cos 60=1/2
ctg 60=cos 60/sin60=1/2:radical 3/2=1/radical3
rad3/2*1/rad3-2*1/2*1/rad3=1/2-1/rad3