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If f(x)=|{:(sinx+sin2x+sin3x,sin2x,sin3x...

If `f(x)=|{:(sinx+sin2x+sin3x,sin2x,sin3x),(3+4sinx,3,4sinx),(1+sinx,sinx,1):}|," then the value of "int_(0)^(pi//2)f(x)dx` is

A

3

B

`2//3`

C

`1//3`

D

0

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