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What is (1+ )^2+( - )^2- ^2 ^2 equal to

Options

  1. A0
  2. B1
  3. C2
  4. D4

Correct answer

A. 0

Step-by-step solution

(1+ )^2+( - )^2- ^2 ^2 aligned & =1+ ^2 ^2 +2 + ^2 + ^2 & -2 - ^2 ^2 & =1+ ^2 ^2 + ^2 + ^2 - ^2 ^2 & = (1+ ^2 ) (1+ ^2 )- ^2 ^2 & = ^2 ^2 - ^2 ^2 & =0 aligned

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