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[" 10.If "cos2x-3cos x+1=(cosec x)/(cot ...

[" 10.If "cos2x-3cos x+1=(cosec x)/(cot x-cot2x)" ,then which of the following is true? "],[[" (A) "x=(2n+1)(pi)/(2),n in I," (B) "x=2n pi,n in I],[" (C) "x=2n pi+-cos^(-1)((2)/(5)),n in I," (D) no real "x]]

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If cos2x-3cosx+1=(cos e c\ x)/(cotx-cot2x),\ then which of the following is true ?

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

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

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

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

" cosec 2x + cot 2x = cot x "

cosec x(sec x-1)-cot x(1-cos x)=tan x-sin x

cosec x(sec x-1)-cot x(1-cos x)=tan x-sin x

(cosec x-sin x)(sec x-cos x)(tan x+cot x)=1