Question

(p – q)(p + q) + 69 – r)(q + r) + (r – p)(r + p) = 0 Show
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Answer 1

Answer:

(p - q) (p + q) + (q - r) (q + r) + (r - p) (r + p)

= p^2 - q^2 + q^2 - r^2 + r^2 - p^2

= 0

Proved.

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