diff --git a/semester3/analysis-ii/cheat-sheet-rb/main.pdf b/semester3/analysis-ii/cheat-sheet-rb/main.pdf index a37e62f..a39cef6 100644 Binary files a/semester3/analysis-ii/cheat-sheet-rb/main.pdf and b/semester3/analysis-ii/cheat-sheet-rb/main.pdf differ diff --git a/semester3/analysis-ii/cheat-sheet-rb/parts/03_diffeq_sol.tex b/semester3/analysis-ii/cheat-sheet-rb/parts/03_diffeq_sol.tex index 42fd901..88b5259 100644 --- a/semester3/analysis-ii/cheat-sheet-rb/parts/03_diffeq_sol.tex +++ b/semester3/analysis-ii/cheat-sheet-rb/parts/03_diffeq_sol.tex @@ -67,10 +67,11 @@ $$ $$ \subtext{$v_1,\ldots,v_k$ are the Multiplicities of $\alpha_1,\ldots,\alpha_k$} -\remark If $\alpha_j = \beta + \gamma i \in \C$ is a root, $\bar{\alpha_j} = \beta - \gamma i$ is too.\\ -To get a real-valued solution, apply: +\remark If $\alpha_j = \beta + \gamma i \in \C$ is a root, $\bar{\alpha_j} = \beta - \gamma i$ is too. + +\smalltext{If only solutions in $\R$ are considered, this can be rewritten:} $$ -e^{\alpha_j x} + e^{\alpha_i x} = e^{\beta x}\left( \cos(\gamma x) + \sin(\gamma x) \right) +c_1e^{\alpha_j x} + c_2e^{\alpha_i x} = e^{\beta x}\left( c_1\cos(\gamma x) + c_2\sin(\gamma x) \right) $$ \begin{subbox}{Explicit Homogeneous Solution}