Output Sympy calculations

If using sympy, make sure that put_out() function properly displays the equations. Should be simple, since Sympy does all the rendering.

```
l, Q, M_u, M_apos_u = sp.symbols("l, Q, M_u, M'u")


W_A_aa = 2 * (Q * (1/3) + Q)
W_A_bb = 2 * (Q * (1/9) + Q * (1/3))

W_A = 2 * (W_A_aa + W_A_bb)

W_A
```