Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: A square with side length 1 is rotated about one vertex by an angle of $\alpha,$ where $0^\circ < \alpha < 90^\circ$ and $\cos \alpha = \frac{4}{5}.$  Find the area of the shaded region that is common to both squares.

[asy]
unitsize(3 cm);

pair A, B, C, D, Bp, Cp, Dp, P;

A = (0,0);
B = (-1,0);
C = (-1,-1);
D = (0,-1);
Bp = rotate(aCos(4/5))*(B);
Cp = rotate(aCos(4/5))*(C);
Dp = rotate(aCos(4/5))*(D);
P = extension(C,D,Bp,Cp);

fill(A--Bp--P--D--cycle,gray(0.7));
draw(A--B---C--D--cycle);
draw(A--Bp--Cp--Dp--cycle);

label("$\alpha$", A + (-0.25,-0.1));
[/asy]
user