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Originally Posted by Karma
At the two bold points it's incorrect. (a + b)(a - b) = t(a - b) That doesn't equal itself.
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t = a + b
(a + b)(a - b) = t(a - b)
(a + b)(a - b) = (a + b)(a - b)
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Also, Subtract, you would add, not subtract t/2.
Moreover, why do you have that in your sig?
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Yeah, seriously.. Why?