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f(x)=|{:(sec x,cos x,,sec^(2) x+cosecx c...

f(x)`=|{:(sec x,cos x,,sec^(2) x+cosecx cot x),(cos^(2) x,cos^(2) x,,cosec^(2) x),(1,cos^(2) x,, cos^(2) x):}|` then,
`int_(0)^(pi//2) `f(x) dx equals

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