Differentiate `a^x`w.r.t. x, where a is a positive constant.

Explanation

To differentiate \( a^x \) with respect to \( x \), where \( a \) is a positive constant, we can follow these steps:

### Step 1: Define the function
Let \( y = a^x \).

### Step 2: Take the natural logarithm of both sides
Taking the natural logarithm of both sides gives us:
\[
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