further work on translation

chapters/pcomplex.qmd

@@ -2,7 +2,7 @@
 engine: julia
 ---
 
-# A Case Study: The Parametric Data Type PComplex
+# Example: The Parametric Data Type `PComplex`
 
 ```{julia}
 #| error: false
@@ -109,9 +109,19 @@ z2 = PComplex(2.0, 0.3)
 Julia uses `//` as an infix constructor for the type `Rational`. We want something equally nice.  
 
 In electronics/electrical engineering, [AC quantities are described by complex numbers.](https://en.wikipedia.org/wiki/Phasor_analysis) A representation of complex numbers by "magnitude" and "phase" is common and is often represented in so-called [phasor form](https://en.wikipedia.org/wiki/Phasor):
+
+:::{.content-visible  unless-format="typst"}
 $$
   z= r\enclose{phasorangle}{\phi} = 3.4\;\enclose{phasorangle}{45^\circ}
 $$
+:::
+
+:::{.content-hidden  unless-format="typst"}
+```{=typst}
+$ z = r angle.acute phi = 3.4 angle.acute 45 degree    $  
+```
+:::
+
 where the angle is usually noted in degrees.  
 
 :::{.callout-note .titlenormal collapse="true"}