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NDA2019MathematicsTrigonometric Ratios & IdentitiesActual

54^ can be expressed as

Options

  1. A9^ + 9^ 9^ - 9^
  2. B9^ - 9^ 9^ + 9^
  3. C9^ + 9^ 9^ - 9^
  4. D36^ 36^

Correct answer

C. 9^ + 9^ 9^ - 9^

Step-by-step solution

aligned & 54^ = (45^ +9^ ) & = 45^ + 9^ 1- 45^ 9^ = 1+ 9^ 1- 9^ & = 1+ 9^ 9^ 1- 9^ 9^ = 9^ + 9^ 9^ - 9^ aligned

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