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NDA2014MathematicsTrigonometric Ratios & IdentitiesActual

What is 20^ + 100^ + 140^ equal to?

Options

  1. A2
  2. B1
  3. C1 / 2
  4. D0

Correct answer

D. 0

Step-by-step solution

aligned & 20^ + 100^ + 140^ & =2 120^ 2 80^ 2 + 140^ & =2 60^ 40^ + 140^ & =2 1 2 40^ + 140^ & = 40^ + 140^ & = 40^ + (180^ -40^ ) & = 40^ - 40^ =0 . aligned

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