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(a/3+b/5) (a/3-b/5)=...

`(a/3+b/5) (a/3-b/5)`=___

A

a) `a^2/a`+`b/2`

B

b) `a^2/a` + 1

C

c) `a^2/9`-`b^2/25`

D

d) `2a/3`-`b/3`

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