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NDA2019MathematicsTrigonometric Ratios & IdentitiesActual

What is 80^ + 40^ - 20^ equal to?

Options

  1. A2
  2. B1
  3. C0
  4. D-19

Correct answer

C. 0

Step-by-step solution

aligned & C+ D & =2 ( C+D 2 ) ( C-D 2 ) & 80^ + 40^ & =2 60^ 20^ & =2 1 2 20^ = 20^ & 80^ + 40^ - 20^ =0 aligned

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