Question

51. Show that (a - b)(a + b) + bc)(b + c) + (c-a) (c + a) = 0.
57 In a building
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Answer 1

Answer:

$a { }^{2} - b {}^{2} + b {}^{2} - c {}^{2} + c {}^{2} - a {}^{2}$

all will get cancelled we will get answer as 0