If cos theta + sin theta = sqrt2 cos the...

If `cos theta + sin theta = sqrt2 cos theta`, then `cos theta - sin theta` is___

A

`sqrt2 tan theta`

B

0

C

`- sqrt2 sin theta`

D

`sqrt2 sin theta`

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UNITED BOOK HOUSE-Trigonometric Rations and Trigonometric Identities-Exercise

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