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sa se calculeze sin² 30 grade +sin² 60 grade .

Răspuns :

[tex]sin(30) = 1/2 \\ sin(60) = \sqrt{3} /2 \\ sin^{2} (30) + sin^{2} (60) = (1/2)^2 + (\sqrt{3} /2)^2 = 1/4 + 3/4 = 4/4 = 1[/tex]