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sa se calculeze sin^2 30 + sin^2 45 + sin^2 60

Răspuns :

=([tex] \frac{1}{2} [/tex])^2 + [tex] \sqrt{2} [/tex] /2)^2 + ([tex] \sqrt{3} [/tex]/2)
=1/4 + 2/4 + 3/4
= 6/4
= 3/2