function z = tobezeroTorus2( t )

% The tobezeroTorus2 function computes the volume of the torus from
% x = 1 to x = t and then subtracts 20 from that value.  This function
% can be passed to Matlab's fzero in order to determine where the volume
% of the cut-off torus is equal to 20 (for Problem 2.d).

z = volumeTorus2(t) - 20 ;