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tg45 x sin45 + tg60 x cos30 - cos45 x ctg45 - tg30 x sin60

Răspuns :

1•√2/2 +√3•√3/2 - √2•1/2-(√3/3)(√3/2)
1•√2/2 si √2•1/2 se reduc
=> 3/2 - 3/6= 3/2 - 1/2 = 2/2 =1.