Let f and g be continuous fuctions on [0...

Let f and g be continuous fuctions on [0, a] such that `f(x)=f(a-x)" and "g(x)+g(a-x)=4 " then " underset0oversetaintf(x)g(x)dx` is equal to

A

`(K)/(2)`

B

`2K`

C

`K`

D

`4K`

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