simplify : (by using formula) (2a-3b+4c)^2-(2a+3b-5c)^2
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(2a-3b+4c)²-(2a+3b-5c)²
(2a-3b+4c-2a+3b-5c)(2a-3b+4c-2a-3b+5c)
(-c)(-6b+9c)
6bc-9c²
3c(2b-3c)
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