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Suppose cos x = 0 and cos(x+z)=1/2. Then...

Suppose `cos x = 0` and `cos(x+z)=1/2`. Then, the possible value (s) of `z` is (are).

A

(a) `pi/6`

B

(b) `(5pi)/(6)`

C

(c) `(7pi)/(6)`

D

(d) `(11pi)/(6)`

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A, B, C, D
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