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#### 2.7.50 Algebra Tutorial Exercise 3

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

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

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

      ' [y,1] RET TAB

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

        V M $ RET

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

        V R -

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

        =

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

        v x 5 RET  TAB  V M $ RET