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1. Calculati sin30° + cos60°
2. Calculati 2cos60° + radical din 3 • cos30°​

Răspuns :

19999991

[tex]1)sin30° + cos60° = \frac{1}{2} + \frac{1}{2} = \frac{1 + 1}{2} = \frac{2}{2} = 1[/tex]

[tex]2)2cos60° + \sqrt{3} \times cos30° = 2 \times \frac{1}{2} + \sqrt{3} \times \frac{ \sqrt{3} }{2} = \frac{2 \times 1}{2} + \frac{ \sqrt{3} \times \sqrt{3} }{2} = \frac{2}{2} + \frac{3}{2} = \frac{2 + 3}{2} = \frac{5}{2} [/tex]

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