cleaner Symbolics output

Author: DawievLill

lectures/tools_and_techniques/geom_series.md

@@ -786,21 +786,24 @@ After that, we'll use `Symbolics.jl` to compute derivatives
 G = (1 + g)
 R = (1 + r)
 p0 = x0 / (1 - G * R ^ (-1))
-print("Our formula is: $p0")
+print("Our formula is")
+p0
 ```
 
 ```{code-cell} julia
 # Partial derivative with respect to g
 dg = Differential(g)
 dp_dg = expand_derivatives(dg(p0))
-print("dp0 / dg is: $dp_dg")
+print("dp0 / dg is")
+dp_dg
 ```
 
 ```{code-cell} julia
 # Partial derivative with respect to r
 dr = Differential(r)
 dp_dr = expand_derivatives(dr(p0))
-print("dp0 / dr is: $dp_dr")
+print("dp0 / dr is")
+dp_dr
 ```
 
 We can see that for $\frac{\partial p_0}{\partial r}<0$ as long as