Wie finden Sie den genauen Wert von cos 5pi / 3?

Antworten:

$1/2$

Erläuterung:

The angle $(5pi)/3" is located in the 4th quadrant "$

where the cos ratio has a positive value.

The 'related' acute angle is $(2pi - (5pi)/3) = pi/3$

and so $cos((5pi)/3) = cos(pi/3)$

Using the $color(blue)" Exact value triangle for this angle"$

$rArr cos((5pi)/3)=cos(pi/3)=1/2$