Q 2540878713.     The number of distinct real roots of

`| (sin x , cos x , cos x), (cos x , sin x, cos x), (cos x, cos x , sin x) | = 0` in the interval

`-pi/4 le x le pi/4` is

WBJEE 2015
A

`0`

B

`2`

C

`1`

D

`> 2`

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