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What is ^2 20^ + ^2 70^ equal to?

Options

  1. A1
  2. B0
  3. C–1
  4. D1 2

Correct answer

A. 1

Step-by-step solution

aligned & ^2 20^ + ^2 70^ & or, ^2 20^ + ^2 (90^ -20^ ) & or, ^2 20^ + ^2 (20^ )=1 . aligned

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