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(1-tan^(2)(45^(@)-A))/(1+tan^(2)(45^(@)-...

`(1-tan^(2)(45^(@)-A))/(1+tan^(2)(45^(@)-A))` is equal to

A

`sin2A`

B

`cos2A`

C

`tan2A`

D

none of these

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The correct Answer is:
A
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