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Arătați ca radical 3cos30grade+sin 30grade+1/2cos 90grade=2

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Sebinsky2015

[tex]\displaystyle\\\sqrt{3}\cdot cos30^{\circ}+sin30^{\circ}+\frac{1}{2}\cdot cos90^{\circ}=\sqrt{3}\cdot \frac{\sqrt{3}}{2}+\frac{1}{2}+\frac{1}{2}\cdot 0 = \frac{3}{2}+\frac{1}{2}+0=\frac{4}{2}=2[/tex]  

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