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If Delta=|[2 cos^2 x, sin 2x, -sin x] ...

If `Delta=|[2 cos^2 x, sin 2x, -sin x] , [sin 2x, 2sin^2x, cos x] ,[sinx, -cosx, 0] |,` , then `int_0^(pi/2) (Delta+Delta') dx` is equal to

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