(1) Calculate the indefinite integral : 

$ \int e^{\minus{}x}\sin 2x\ dx$.

(2) Evaluate the definite integral :

$ \int_0^{\pi} e^{\minus{}x}|\sin 2x|\ dx$.
### Part 1: Calculate the indefinite integral \( \int e^{-x} \sin 2x \, dx \)

To solve this integral, we will use the method of integration by parts twice. Recall the integration by parts formula:
\[
\int u \, dv = uv - \int v \, du
\]

Let:
\[
u = \sin 2x \quad \text{and} \quad dv = e^{-x} \, dx
\]

Then:
\[
du = 2 \cos 2x \, dx \quad \text{and} \quad v = -e^{-x}
\]

Applying integration by parts:
\[
\int e^{-x} \sin 2x \, dx = -e^{-x} \sin 2x - \int (-e^{-x}) (2 \cos 2x) \, dx
\]
\[
= -e^{-x} \sin 2x + 2 \int e^{-x} \cos 2x \, dx
\]

Now, we need to integrate \( \int e^{-x} \cos 2x \, dx \). We use integration by parts again with:
\[
u = \cos 2x \quad \text{and} \quad dv = e^{-x} \, dx
\]

Then:
\[
du = -2 \sin 2x \, dx \quad \text{and} \quad v = -e^{-x}
\]

Applying integration by parts again:
\[
\int e^{-x} \cos 2x \, dx = -e^{-x} \cos 2x - \int (-e^{-x}) (-2 \sin 2x) \, dx
\]
\[
= -e^{-x} \cos 2x - 2 \int e^{-x} \sin 2x \, dx
\]

Let \( I = \int e^{-x} \sin 2x \, dx \). Substituting back, we get:
\[
I = -e^{-x} \sin 2x + 2 \left( -e^{-x} \cos 2x - 2I \right)
\]
\[
I = -e^{-x} \sin 2x - 2e^{-x} \cos 2x - 4I
\]
\[
I + 4I = -e^{-x} \sin 2x - 2e^{-x} \cos 2x
\]
\[
5I = -e^{-x} (\sin 2x + 2 \cos 2x)
\]
\[
I = -\frac{1}{5} e^{-x} (\sin 2x + 2 \cos 2x)
\]

Thus, the indefinite integral is:
\[
\boxed{-\frac{1}{5} e^{-x} (\sin 2x + 2 \cos 2x) + C}
\]

### Part 2: Evaluate the definite integral \( \int_0^{\pi} e^{-x} |\sin 2x| \, dx \)

The integrand \( e^{-x} |\sin 2x| \) is nonnegative for \( 0 \leq x \leq \frac{\pi}{2} \) and nonpositive for \( \frac{\pi}{2} \leq x \leq \pi \). Thus, we can split the integral as follows:
\[
\int_0^{\pi} e^{-x} |\sin 2x| \, dx = \int_0^{\pi/2} e^{-x} \sin 2x \, dx - \int_{\pi/2}^{\pi} e^{-x} \sin 2x \, dx
\]

Using the result from Part 1, we evaluate the indefinite integral at the bounds:
\[
\int e^{-x} \sin 2x \, dx = -\frac{1}{5} e^{-x} (\sin 2x + 2 \cos 2x)
\]

Evaluating from \( 0 \) to \( \frac{\pi}{2} \):
\[
\left[ -\frac{1}{5} e^{-x} (\sin 2x + 2 \cos 2x) \right]_0^{\pi/2}
\]
\[
= \left( -\frac{1}{5} e^{-\pi/2} (\sin \pi + 2 \cos \pi) \right) - \left( -\frac{1}{5} e^{0} (\sin 0 + 2 \cos 0) \right)
\]
\[
= \left( -\frac{1}{5} e^{-\pi/2} (0 - 2) \right) - \left( -\frac{1}{5} (0 + 2) \right)
\]
\[
= \frac{2}{5} e^{-\pi/2} + \frac{2}{5}
\]

Evaluating from \( \frac{\pi}{2} \) to \( \pi \):
\[
\left[ -\frac{1}{5} e^{-x} (\sin 2x + 2 \cos 2x) \right]_{\pi/2}^{\pi}
\]
\[
= \left( -\frac{1}{5} e^{-\pi} (\sin 2\pi + 2 \cos 2\pi) \right) - \left( -\frac{1}{5} e^{-\pi/2} (\sin \pi + 2 \cos \pi) \right)
\]
\[
= \left( -\frac{1}{5} e^{-\pi} (0 + 2) \right) - \left( -\frac{1}{5} e^{-\pi/2} (0 - 2) \right)
\]
\[
= -\frac{2}{5} e^{-\pi} + \frac{2}{5} e^{-\pi/2}
\]

Combining both parts:
\[
\int_0^{\pi} e^{-x} |\sin 2x| \, dx = \left( \frac{2}{5} e^{-\pi/2} + \frac{2}{5} \right) - \left( -\frac{2}{5} e^{-\pi} + \frac{2}{5} e^{-\pi/2} \right)
\]
\[
= \frac{2}{5} e^{-\pi/2} + \frac{2}{5} + \frac{2}{5} e^{-\pi} - \frac{2}{5} e^{-\pi/2}
\]
\[
= \frac{2}{5} + \frac{2}{5} e^{-\pi}
\]

Thus, the definite integral is:
\[
\boxed{\frac{2}{5} (1 + e^{-\pi})}
\]