Update cheatsheet.fr.md

12.temporary_ins/69.waves/30.n3/20.overview/cheatsheet.fr.md

@@ -64,18 +64,9 @@ $`\newcommand{\ddpt}[1]{\overset{\large\bullet\bullet}{#1}}`$
                      &cos(a-b)=cos(a)cos(b)+-sin(a)sin(b)\end{align}
                \right\}\Longrightarrow\\
         \quad\quad cos^2(a)=cos(a)cos(a)=\dfrac{1}{2}[cos(a+a)+cos(a-a)]\\
-        \quad\quad\quad\quad=\dfrac{1}{2}[1 + cos(2a)]}}`$
-
-  $`\begin{align} A_{onde} &= \left| \,2\,A\cdot cos\Big(\dfrac{\varphi_1 - \varphi_2}{2} \Big) \,\right|\\
-  &\\
-  &=\sqrt{4\,A^2 \cdot \underbrace{cos\Big(\dfrac{\varphi_1 - \varphi_2}{2}\Big)\,cos\Big(\dfrac{\varphi_1 - \varphi_2}{2}\Big)}
-  _{\left.\begin{align} cos(a+b)=cos(a)cos(b)-sin(a)sin(b)\\
-   cos(a-b)=cos(a)cos(b)+-sin(a)sin(b)\end{align}\right\}\Rightarrow\\
-  &cos(a)cos(a)=cos^2(a)=\frac{1}{2}[cos(a+a)+cos(a-a)]\\
-  &=\frac{1}{2}[1 + cos(2a)]}
-  }\end{align}`$
-
-$`\quad\quad =\sqrt{2\,A^2 \cdot \big(1 + cos\,(\varphi_1 - \varphi_2)\big)`$
+        \quad\quad\quad\quad=\dfrac{1}{2}[1 + cos(2a)]}}`$   
+   <br>
+   $`\quad\quad =\sqrt{2\,A^2 \cdot \big(1 + cos\,(\varphi_1 - \varphi_2)\big)}`$