Din formula fundamentala a trigonometriei:
[tex] \cos{x} = \sqrt{1 - sin^2 x} = \sqrt{1 - \frac{3}{4}} = \sqrt{\frac{1}{4}} = \frac{\sqrt{1}}{\sqrt{4}} = \frac{1}{2}[/tex]
[tex] ctg x = \frac{\cos{x}}{\sin{x}} = \frac{\frac{1}{2}}{\frac{\sqrt{3}}{2}} = \frac{1}{\sqrt{3}} = \frac{\sqrt{3}}{3}[/tex]
