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If f (a + b - x) = f (x) then int (a) ^...

If `f (a + b - x) = f (x)` then ` int _(a) ^(b) x . f (x) dx` is equal to _______.

A

`(a +b) /(2) int _(a) ^(n) f (x) dx`

B

`(b -a)/( 2) int _(a) ^(n) f (x) dx`

C

`(a +b)/( 2) int _(a) ^( b) f (b-x) dx `

D

`(b -a)/(2) int _(a) ^(b) f (x) dx`

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