Question

Calculeaza in 2 moduri

$cos\frac{5\pi}{6}$
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Answer 1

Răspuns:

Explicație pas cu pas:

cos5π/6=cos(π-π/6)=-cosπ/6=-√3/2

sau

cos 5π/6=cos(π/2+π/3)=-sinπ/3=-√3/2

Answer 2

Răspuns:

cos5pi/6=cos(pi-pi/6)=-cos pi/6=radical3/2