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int(a)^(b) f(x) dx =...

`int_(a)^(b) f(x) dx = `

A

`2int_(a)^(b)f(x)dx`

B

`int_(a)^(b)f(a-x)dx`

C

`int_(a)^(b)f(b-x)dx`

D

`int_(a)^(b)f(a+b-x)dx`.

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The correct Answer is:
D
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