trigonometry · worked example

Solve cos(30°)

Problem

$\cos(30°)$

Step-by-step solution

Dalam segitiga $30$ - $60$ - $90$ , sisi-sisinya berbanding $1 : \sqrt{3} : 2$ .
Kosinus $30°$ = sisi samping/hipotenusa = $\frac{\sqrt{3}}{2}$ .

Answer

$\cos(30°) = \tfrac{\sqrt{3}}{2}$

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