Question

3. Simplify:
(a) (x + y - z) + (y + z - x) + (z + x - y)
(c) (x2 + y2 + 1) + (x2 + y2 – 1) + (x2 - y2 + 1) + (y2 + 1 – x²)​

Answer 1

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Step-by-step explanation:

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