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If tan theta=(sin alpha- cos alpha)/(sin...

If `tan theta=(sin alpha- cos alpha)/(sin alpha+cos alpha)`, then

A

`sin alpha - cos alpha = sqrt(2) sin theta`

B

`sin alpha + cos alpha = sqrt (2) cos theta`

C

`cos 2 theta = sin 2 alpha `

D

`sin 2 theta + cos 2 alpha = 0`

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