- #1
PFStudent
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1. Homework Statement .
Let,
[tex]
{{f(x)}, {{{f}^{\prime}}{\left(x\right)}}, {{{f}^{\prime\prime}}{\left(x\right)}},...,} = {{f}, {{f}^{\prime}}, {{f}^{\prime\prime}},...,}
[/tex]
Prove (without just differentiating the RHS),
[tex]
{{\int_{}^{}}{{f}^{\prime}}{\left({{f}+{{f}^{\prime\prime}}}\right)}{dx}} = { {{\frac{1}{2}}\left({f}^{2}}+{{{f}^{\prime}}^{2}\right)}+{C} }
[/tex]
2. Homework Equations .
Knowledge of Calculus and Differential Equations.
3. The Attempt at a Solution .
In the lecture notes the above problem was presented as part of another proof. I'm really not sure where to begin on this. Maybe integration by parts?
Thanks,
-PFStudent
EDIT: Thanks Mark44 for the edit.
Let,
[tex]
{{f(x)}, {{{f}^{\prime}}{\left(x\right)}}, {{{f}^{\prime\prime}}{\left(x\right)}},...,} = {{f}, {{f}^{\prime}}, {{f}^{\prime\prime}},...,}
[/tex]
Prove (without just differentiating the RHS),
[tex]
{{\int_{}^{}}{{f}^{\prime}}{\left({{f}+{{f}^{\prime\prime}}}\right)}{dx}} = { {{\frac{1}{2}}\left({f}^{2}}+{{{f}^{\prime}}^{2}\right)}+{C} }
[/tex]
2. Homework Equations .
Knowledge of Calculus and Differential Equations.
3. The Attempt at a Solution .
In the lecture notes the above problem was presented as part of another proof. I'm really not sure where to begin on this. Maybe integration by parts?
Thanks,
-PFStudent
EDIT: Thanks Mark44 for the edit.
Last edited: