AB is a vertical tower. the point A on ground and c is mid point of AB the part CB subtends an angle alpha at a point p on ground, if AP=nAB THEN tan 'alpha' is-
  1. n(n+1) 
  2. n/(2n2-1)
  3. n2/(2n2+1)
  4. n/2n2+1​​

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