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Manipal MET2012MathematicsTrigonometric Ratios & Identities

If + + = , then the value of ^2 + ^2 - ^2 is equal to

Options

  1. A2
  2. B2
  3. C2
  4. D2

Correct answer

C. 2

Step-by-step solution

aligned & ^2 + ( - ) ( + ) & = ^2 + ( - ) ( - ) & = [ + ( - )] & = [ ( -( + ))+ ( - )] & = [ ( - )+ ( + )] & =2 aligned

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