Question

$\cos( \frac{\pi}{2} - x) = \\ \\ \\ \cos(60) = \cos( \frac{\pi}{2} - \: \: \: ) =$
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Answer 1

Răspuns:

Explicație pas cu pas:

cos(π/2-x)=sinx

cos 60=cosπ/3=cos(π/2-π/6=sin π/6

Answer 2

$\it cos(\dfrac{\pi}{2}-x)=sinx\\ \\ cos60^o=cos(\dfrac{\pi}{2}-\dfrac{\pi}{6})$