Question

sa se calculeze sin² 30 grade +sin² 60 grade .

Answer 1

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