<s>[INST] Is $\int_{-\infty}^0 \max\left(\frac{\cos(x)}{x},\frac{\sin(x)}{x}\right)dx+\int_0^\infty \min\left(\frac{\cos(x)}{x},\frac{\sin(x)}{x}\right)dx=\pi?$ Playing around with floor functions, I thought about using the maximum and minumum of  functions to “merge” 2 asymptotic graphs which intersected each other infinitely. I then thought of the classical trigonometric Dirichlet Integral. Here is a graph of our goal integral. Please note the sign function:
$$\int_\Bbb R f(x)dx=\int_{-\infty}^0 \max\left(\frac{\cos(x)}{x},\frac{\sin(x)}{x}\right)dx+ \int_0^\infty \min\left(\frac{\cos(x)}{x},\frac{\sin(x)}{x}\right)dx = \int_0^\infty \min\left(\frac{\cos(x)}{x},\frac{\sin(x)}{x}\right)+ \max\left(-\frac{\cos(x)}{x},\frac{\sin(x)}{x}\right)dx =\int_0^\infty \frac{\cos(x) \text{sgn}\left(\frac{\sin(x)}x - \frac{\cos(x)}x\right)}{2 x} +\frac{\sin(x) \text{sgn}\left(\frac {\cos(x)}x - \frac{\sin(x)}x\right)}{2 x} + \frac{\sin(x)}{2 x} + \frac{\cos(x)}{2 x}-\frac{\cos(x) \text{sgn}\left(\frac{\sin(x)}x + \frac{\cos(x)}x\right)}{2 x}+ \frac{\sin(x) \text{sgn}\left(-\frac {\cos(x)}x - \frac{\sin(x)}x\right)}{2 x} + \frac{\sin(x)}{2 x} - \frac{\cos(x)}{2 x} dx =\frac\pi 2+ \int_0^\infty \frac{\cos(x) \text{sgn}\left(\frac{\sin(x)}x - \frac{\cos(x)}x\right)}{2 x} +\frac{\sin(x) \text{sgn}\left(\frac {\cos(x)}x - \frac{\sin(x)}x\right)}{2 x} -\frac{\cos(x) \text{sgn}\left(\frac{\sin(x)}x + \frac{\cos(x)}x\right)}{2 x}+ \frac{\sin(x) \text{sgn}\left(-\frac {\cos(x)}x - \frac{\sin(x)}x\right)}{2 x} dx=\frac\pi 2+\frac12 \int_0^\infty\frac{|\cos(x)+\sin(x)|}{x}-\frac{|\cos(x)-\sin(x)|}{x}dx=\boxed{ \frac\pi 2+\frac1{\sqrt 2} \int_0^\infty\frac{\left|\sin\left(x+\frac\pi 4\right)\right|}{x}-\frac{\left|\sin\left(x-\frac\pi 4\right)\right|}{x}dx }=\frac{\pi}{2}+ \lim_{x\to \infty}\left(\frac12\text{Ci}(x) \left[\text {sgn}\,\sin\left(x + \frac \pi4\right) -\text{sgn}\,\cos \left(x + \frac{\pi}4\right)\right] + \frac12 \text{Si}(x) \left[\text {sgn}\,\sin\left(x + \frac{\pi}4\right) + \text{sgn}\,\cos \left(x + \frac{\pi}4\right)\right]\right)\mathop=^{???}\pi$$
Our integral uses trigonometric integrals. I need to verify this solution. Here is a graph of that final integrand. Here is a graph of the actual problem; this plot is also a visual representation of our constant:


We used the Dirichlet Integral in one step. Here is a verification of the maximum and minimum function terms. Can you please verify this solution or give another way to evaluate it? Desmos and Wolfram Alpha cannot find a numerical approximation for the problem. Please correct me and give  feedback!
Similar results which should have no typos:
$$\int_\Bbb R \min \left(\frac{\sin(x)}{x},e^{-|x|}\right)dx=2$$
$$\int_\Bbb R \max\left(\frac{\sin(x)}{x},e^{-|x|}\right)dx=\pi$$
Final result using Silver Ratio $\delta_S$:
$$\int_\Bbb R f(x)dx=\int_{-\infty}^0 \max\left(\frac{\cos(x)}{x},\frac{\sin(x)}{x}\right)dx+ \int_0^\infty \min\left(\frac{\cos(x)}{x},\frac{\sin(x)}{x}\right)dx=\frac\pi 2+\coth^{-1}\left(\sqrt 2\right)=\frac\pi 2+\ln\left(\sqrt 2+1\right)=\frac\pi 2 +\ln(\delta_S)= 2.452169913814439644463931016619543751126745027949188…$$
 [/INST] Problem: Prove that
$$\int_{0}^{\infty} \frac{\Big|\sin\left(x+\frac{\pi}{4}\right)\Big| - \Big|\sin\left(x-\frac{\pi}{4}\right)\Big|}{x} \,\mathrm{d}x = \sqrt{2}\ln(1 + \sqrt{2}).$$
Remark: We have
$\lim_{x\to 0}\frac{\Big|\sin\left(x+\frac{\pi}{4}\right)\Big| - \Big|\sin\left(x-\frac{\pi}{4}\right)\Big|}{x} = \sqrt2$.
Sketch of an alternative proof:
Using the identity
$$\left|\sin x\right| = \frac{2}{\pi}-\sum_{k = 1}^\infty \frac{4}{\pi(4k^2-1)}\cos(2k x),$$
we have
$$\frac{|\sin(x + \pi/4)| - |\sin(x - \pi/4)|}{x}
= \sum_{k=1}^\infty \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\, \frac{\sin (2kx)}{x}.$$
Let
\begin{align*}
 f(N) &= \int_0^N \frac{|\sin(x + \pi/4)| - |\sin(x - \pi/4)|}{x}\,\mathrm{d} x, \\
 g(N) &= \int_0^N \sum_{k=1}^N \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\, \frac{\sin (2kx)}{x}\, \mathrm{d} x.
\end{align*}
First, we have
\begin{align*}
 g(N) &= \sum_{k=1}^N \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)} \int_0^N \frac{\sin (2kx)}{x}\, \mathrm{d} x\\
 &= \sum_{k=1}^N \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\int_0^{2kN} \frac{\sin y}{y}\,\mathrm{d} y\\
 &= \sum_{k=1}^N \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\cdot\frac{\pi}{2}
 - \sum_{k=1}^N \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\int_{2kN}^\infty \frac{\sin y}{y}\,\mathrm{d} y
\end{align*}
where we have used $\int_0^\infty \frac{\sin y}{y}\,\mathrm{d} y = \frac{\pi}{2}$.
Then, one can prove that
$$\lim_{N\to \infty} g(N) =
\sum_{k=1}^\infty \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\cdot \frac{\pi}{2} = \sum_{m=1}^\infty \frac{4 (-1)^{m + 1}}{4(2m - 1)^2 - 1} = \sqrt{2}\ln(1 + \sqrt{2}).$$
Second, we have
\begin{align*}
 f(N) - g(N) &= \int_0^N \sum_{k=N+1}^\infty \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\, \frac{\sin (2kx)}{x}\, \mathrm{d} x\\
 &= \int_0^{1/\sqrt{N}} \sum_{k=N+1}^\infty \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\, \frac{\sin (2kx)}{x}\, \mathrm{d} x
 + \int_{1/\sqrt{N}}^N \sum_{k=N+1}^\infty \frac{8\sin\frac{k\pi}{2}}{\pi(4k^2 - 1)}\, \frac{\sin (2kx)}{x}\, \mathrm{d} x\\
 &\to 0, \quad  \mathrm{as}\quad N \to \infty.
\end{align*}
Thus, we have $\lim_{N\to \infty} f(N) = \lim_{N\to \infty} g(N) = \sqrt{2}\ln(1 + \sqrt{2})$.
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