Update 12.temporary_ins/90.electromagnetism-in-vacuum/20.electromagnetic-waves-vacuum/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/20.electromagnetic-waves-vacuum/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/20.electromagnetic-waves-vacuum/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/40.maxwell-quasi-stationary-fields-approximation/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/40.maxwell-quasi-stationary-fields-approximation/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/40.maxwell-quasi-stationary-fields-approximation/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/30.maxwell-electromagnetism-potentials/cheatsheet.fr.md