Update cheatsheet.fr.md

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

@@ -1075,9 +1075,9 @@ $`\hspace{0.6cm}+\dfrac{\Delta A}{2}\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Del
 $`\hspace{1.3cm} - \left.\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} + sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right]`$   
 <br>
 $`\;=A_m\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} - \require{cancel}\cancel{sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}}\right.\right.`$
-$`\hspace{1.3cm} + \left.\left.cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} + sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right]`$
-$`\hspace{0.6cm}+\dfrac{\Delta A}{2}\left[\left(cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} - sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right.\right.`$
-$`\hspace{1.3cm} - \left.\left.cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} - sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right]`$
+$`\hspace{1.3cm} + \left.\left.cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2} + \require{cancel}\cancel{sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}}\right)\right]`$
+$`\hspace{0.6cm}+\dfrac{\Delta A}{2}\left[\left(\require{cancel}\cancel{cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2}} - sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right.\right.`$
+$`\hspace{1.3cm} - \left.\left.\require{cancel}\cancel{cos\,\varphi_m\;cos\,\dfrac{\Delta\varphi}{2}} - sin\,\varphi_m\;sin\,\dfrac{\Delta\varphi}{2}\right)\right]`$