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Find x if cos x =-1//2. if X lies in II...

Find x if `cos x =-1//2`. if X lies in III Quad. ज्ञात कीजिए यदि `cos x =-1//2` है।

A

a)`(3 Pi)/2`

B

b)`(2 Pi)/3`

C

c)`(5 Pi)/2`

D

d)`(4 Pi)/3`

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