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1) Calculaeaza:
cos60cos30+ sin60sin30


Răspuns :

1/2*rad3/2+rad3/2*1/2=2radical din 3/4=rad3/2
cos60=1/2
cos30=[tex] \sqrt{3} [/tex]/2
sin60=[tex] \sqrt{3} [/tex]/2
sin30=1/2