Convert `r=cos e cthetae^(rcostheta)` into its equivalent Cartesian equation.

Explanation

To convert the polar equation \( r = \cos \theta e^{r \cos \theta} \) into its equivalent Cartesian equation, we can follow these steps:

### Step-by-Step Solution:

1. **Start with the given polar equation:**
\[ r = \cos \theta e^{r \cos \theta} \]
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