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What is the value of [1-tan(90^(@)-theta...

What is the value of `[1-tan(90^(@)-theta)]^(2)*[cos^(2)(90^(@)-theta) -1]`?

A

`-sin 2 theta`

B

`-cos 2 theta`

C

`cos 2 theta`

D

`sin 2 theta`

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