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sa se calculeze
[tex] {sin}^{2} 70 + {sin}^{2} 20[/tex]


Răspuns :

[tex]\sin^270^ {\circ} + \sin^2 20^{\circ} = \\ \\ = \sin^2(90-20)^{\circ} +\sin^2 2^{\circ} = \\ \\ = \cos^2 20^{\circ}+ \sin^2 20^{\circ} = \\ \\ = 1[/tex]