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The values of alpha for which the equat...

The values of `alpha` for which the equation `alpha^2/(1-tan^2x)=(sin^2x+alpha^2-2)/(cos2x)` has solution can be

A

`alpha le -1 `

B

`alpha ge 1`

C

`alpha =1//2`

D

`alpha ` in any real number

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The correct Answer is:
A, B
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