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cos 2x- 3 cos x + 1=(1)/((cot 2 x - cot ...

` cos 2x- 3 cos x + 1=(1)/((cot 2 x - cot x)sin (x-pi))` holds , if

A

(a) cos x =0

B

(b) cos x =1

C

(c) `cos x=(5)/(2)`

D

(d) for no value of x

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A
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