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(a+ b + c- d)^2-(a-b-c+d)^2 =?...

`(a+ b + c- d)^2-(a-b-c+d)^2` =?

A

`4a(b+c+d) `

B

`2a(b+c-d) `

C

`4a(b+c-d) `

D

`2a(b+c+d)`

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PINNACLE-ALGEBRA-EXERCISE
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