factor completely: x2–2xc +c2–d2
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x*2-2xc+c*2-d*2 (use identity (a-b)*2)
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(x-c)*2-d*2 (use identity a*2-b*2)
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(x-c-d)(x-c+d)
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(x-c)*2-d*2 (use identity a*2-b*2)
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(x-c-d)(x-c+d)
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