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#### 3.7.50 Algebra Tutorial Exercise 3

         1:  x sin(pi x)         1:  (sin(pi x) - pi x cos(pi x)) / pi^2
             .                       .

           ' x sin(pi x) <RET>   m r   a i x <RET>

         1:  [y, 1]
         2:  (sin(pi x) - pi x cos(pi x)) / pi^2
             .

           ' [y,1] <RET> <TAB>

         1:  [(sin(pi y) - pi y cos(pi y)) / pi^2, (sin(pi) - pi cos(pi)) / pi^2]
             .

             V M $ <RET>

         1:  (sin(pi y) - pi y cos(pi y)) / pi^2 + (pi cos(pi) - sin(pi)) / pi^2
             .

             V R -

         1:  (sin(3.14159 y) - 3.14159 y cos(3.14159 y)) / 9.8696 - 0.3183
             .

             =

         1:  [0., -0.95493, 0.63662, -1.5915, 1.2732]
             .

             v x 5 <RET>  <TAB>  V M $ <RET>