Factorization of A2 + B2 + c2-2c-2ab-1 Factorization a ^ 2 + B ^ 2 + C ^ 2-2c-2ab + 1,

It should be a ^ 2 + B ^ 2-C ^ 2 + 2c-2ab-1

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1. Let a, B, C be the three sides of triangle ABC, and (C-B) x2 + 2 (B-A) x + A-B = 0, with two equal real roots, prove that triangle ABC is isosceles triangle
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8. Known: as shown in the figure, in △ ABC, if ∠ A is an acute angle, points D and E are on AB and AC respectively, and ∠ DCB = ∠ EBC = 12 ∠ A. verification: BD = CE
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