Mashaal Masha
If $a=c+d$, which of the following is equivalent to the expression $x^{2}-c^{2}-2cd-d^{2}$?
Difficulty: Hard
A: 

$(x+a)^{2}$

B: 

$(x-a)^{2}$

C: 

\((x+a)(x-a)\)

D: 

$x^{2}-ax-a^{2}$

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