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Evaluate the following : (sin theta + ...

Evaluate the following :
`(sin theta + cos theta)^(2) + (sin theta - cos theta)^(2)`

A

`2 sin^2 theta + cos^2 theta`

B

2

C

`2 sin^2 theta + 4 cos^2 theta`

D

`2 sin^2 theta`

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