* 2013WT2
** Remarks: Has 2-page formula sheet
** (1) [12.4,12.5] two planes, one line given; 
*** (a) find intersection of two planes
*** (b) distance from plane to line
*** (c) area of a parallelogram in plane given x in [0,3] and y in [0,2]
** (2) [14.5,14.6] chain rule, maximum increase along surface
** (3) [14.7] critical points (max,min,saddle) of given f(k; x,y), k a parameter
** (4) [14.8] Lagrange multipliers: min and max of f(x,y,z) on a surface
** (5) [15.*] double integral of radial function over region bounded by a circle and a line
** (6) [15.3,15.7] change the order of integration in a double integral (i.e., dx dy  to dy dx) and in a triple integral
** (7) [15.7-15.10] evaluate a triple integral above z=y^2 and below z=4-x^2
** (8) [15.8,15.9] triple integral in cylindrical AND spherical coordinates