Simplify each of the following expressions: `4s t\ (s-t)-6s^2(t-t^2)-3t^2(2s^2-s)+2s t(s-t)`

Explanation

To simplify the expression \( 4st(s-t) - 6s^2(t-t^2) - 3t^2(2s^2-s) + 2st(s-t) \), we will follow these steps:

### Step 1: Expand the expression
We will distribute each term in the expression:

1. \( 4st(s-t) = 4s^2t - 4st^2 \)
2. \( -6s^2(t-t^2) = -6s^2t + 6s^2t^2 \)
3. \( -3t^2(2s^2-s) = -6s^2t^2 + 3st^2 \)
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