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Let ∫ = x 0 dt ) t ( g ) x ( f , where g is a non-zero even function. If f(x + 5) = g (x), then ∫ x 0 dt ) t ( f equals-

1. ∫ + 5 5 x dt ) t ( g 5
2. ∫ + 5 x 5 dt ) t ( g 2
3. ∫ + 5 x 5 dt ) t ( g
4. ∫ + 5 5 x dt ) t ( g

Correct answer: ∫ + 5 5 x dt ) t ( g

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