Question

calcule o valor de x...

Answer 1

$\cos(60) = \frac{1}{2} \\ \frac{1}{2} = \frac{x}{ \frac{ \sqrt{2} }{2} } \\ \frac{1}{2} = \frac{x \times 2}{ \sqrt{2} } \\ 4x = 1 \times \sqrt{2} \\ x = \frac{ \sqrt{2} }{4}$