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30. Student A stated the formula for the volume of con as V= $\frac{1}{3}\left({\mathrm{\pi l}}^2\mathrm{h}\right)-\frac{1}{3}{\mathrm{\pi lh}}^3$ and the student B as $V=\frac{1}{3}{\mathrm{\pi r}}^2\mathrm{h}$
(a) Are the formulae started by A and B true ? If yes, why?
(b) By starting formula different than as usual which of the following values is depicted. 
          (i) Truth value
          (ii) Social value.
         (iii) Respect for other views 
         (iv) Equality.