Respuesta :

Answer:

3rd option

Step-by-step explanation:

cos([tex]\frac{5\pi }{6}[/tex] ) ← is an angle in the 2nd quadrant where cos < 0

= - cos(π - [tex]\frac{5\pi }{6}[/tex] )

= - cos([tex]\frac{\pi }{6}[/tex] )

= - [tex]\frac{\sqrt{3} }{2}[/tex]

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