Evaluate: `int1/(x^2+4x-5)\ dx`

Explanation

To evaluate the integral \( \int \frac{1}{x^2 + 4x - 5} \, dx \), we will follow these steps:

### Step 1: Factor the Quadratic Expression
First, we need to factor the quadratic expression in the denominator:
\[ x^2 + 4x - 5 \]
To factor this, we look for two numbers that multiply to \(-5\) (the constant term) and add to \(4\) (the coefficient of \(x\)). The numbers \(5\) and \(-1\) work:
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