If $(1 + \sin A)(1 + \sin B)(1 + \sin C)$$ = (1 - \sin A)(1 - \sin B)(1 - \sin C),$ then each side is equal to
If $(1 + \sin A)(1 + \sin B)(1 + \sin C)$$ = (1 - \sin A)(1 - \sin B)(1 - \sin C),$ then each side is equal to
- A
$ \pm \sin A\sin B\sin C$
- B
$ \pm \cos A\cos B\cos C$
- C
$ \pm \sin A\cos B\cos C$
- D
$ \pm \cos A\sin B\sin C$
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$\cos 15^\circ = $
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