Find the equation whose roots are the `7^(th)`powers of the roots of the equation `x^2-2xcostheta+1=0`

Explanation

To find the equation whose roots are the 7th powers of the roots of the equation \(x^2 - 2x \cos \theta + 1 = 0\), we will follow these steps:

### Step 1: Find the roots of the given quadratic equation
The given equation is:
\[ x^2 - 2x \cos \theta + 1 = 0 \]
We can use the quadratic formula:
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