Update cheatsheet.fr.md

10.temporary-m3p2/16.waves/20.n2/10.concept-of-wave-and-wave-phenomena-2/20.overview/cheatsheet.fr.md

@@ -1071,12 +1071,12 @@ $`\;\;+\dfrac{\Delta A}{2}\left[cos\left(\varphi_m+\dfrac{\Delta\varphi}{2}\righ
 **$`\boldsymbol{\mathbf{U(t)}}`$**
 $`\;=A_m\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} - sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right.`$
 $`\hspace{1.3cm} + \left.\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} + sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right]`$
-$`\hspace{0.6cm}+\dfrac{\Delta A}{2}\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} + sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right.`$
+$`\hspace{0.6cm}+\dfrac{\Delta A}{2}\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} - sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right.`$
 $`\hspace{1.3cm} - \left.\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} + sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right]`$   
 <br>
 $`\;=A_m\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} - \require{cancel}\cancel{sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}}\right.\right.`$
 $`\hspace{1.3cm} + \left.\left.cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} + sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right]`$
-$`\hspace{0.6cm}+\dfrac{\Delta A}{2}\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} + sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right.\right.`$
+$`\hspace{0.6cm}+\dfrac{\Delta A}{2}\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} - sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right.\right.`$
 $`\hspace{1.3cm} - \left.\left.cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} - sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right]`$