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Aratati ca cos^2 30 + sin^2 60 - 2sin 60 * cos 30 = 0

Aratati Ca Cos2 30 Sin2 60 2sin 60 Cos 30 0 class=

Răspuns :

Targoviste44

[tex]\it cos^2 30^o+sin^2 60^o -2sin60^ocos30^o=(cos30^o-sin60^o)^2=\bigg(\dfrac{\sqrt3}{2}-\dfrac{\sqrt3}{2}\bigg)^2=0[/tex]

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