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What are all the exact solutions of cos x = - sqrt(3) / 2 on the interval pi <= x <= 2 pi ? Give your answer in radians.


A )pi / 6 and 11 pi /6


B ) 5 pi / 6


C ) 7 pi / 6


D ) 5 pi / 6 and 7 pi / 6

Verified Answer :

JT6

Interval: pi <= x <= 2pi OR 180<= x <= 360

This means the interval must be between Quadrants 3/4

pi/6 = 30 degrees which is < 180

5pi/6 = 150 degrees which is < 180

7pi/6 = last option but = 210 degrees which is in Q3

cos (7pi/6) = - sqrt(3)/2

Ans: C

Answer:

c

Step-by-step explanation:

edg2020

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