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AP EAMCET2015MathematicsTrigonometric Ratios & Identities

If (120^ - ) (120^ + )= 1 3 , then is equal to

Options

  1. An 3 + 18 , n Z
  2. Bn 3 + 12 , n Z
  3. Cn 12 + 12 , n Z
  4. Dn 3 + 6 , n Z

Correct answer

A. n 3 + 18 , n Z

Step-by-step solution

We have given, (120^ - ) (120^ + )= 1 3 Since, we know aligned & (120^ - ) (120^ + )= 3 & 3 = 1 3 3 = 6 & 3 =n + 6 & = n 3 + 18 , n Z aligned

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