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If f(1) ,(x) and f(2)(x) are defined on ...

If `f_(1) ,(x)` and `f_(2)(x)` are defined on a domain `D_(1)`, and `D_(2)` , respectively, then domain of `f_(1)(x) + f_(2) (x)` is :

A

`D_(1) cap D_(2)`

B

`D_(1) cup D_(2)`

C

`D_(1) - D_(2)`

D

`D_(2) -D_(1)`

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