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If cos (theta - alpha),cos(theta),Cos(th...

If `cos (theta - alpha),cos(theta),Cos(theta + alpha)` are in H.P. and ` cos alpha ne 1`, then angle `alpha` lie in the

A

II quadrant

B

III quadrant

C

I quadrant

D

IV quadrant

Text Solution

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The correct Answer is:
3,4
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