Q 1544845753.     If `Delta(x) = |(1,cosx,1-cosx),(1+sinx,cosx,1+sinx-cosx),(sinx,sinx,1)|`

then `int_(0)^(pi/4) Delta(x)dx` is equal to

VIT 2014
A

`1/4`

B

`1/2`

C

`0`

D

`-1/4`

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