Simplification of a Force and couple system Wrench Problem

1. The problem statement, all variables and given/known data

3. The attempt at a solution

I understand 90% of the problem and how to do it, I just can’t wrap my head around how they managed to get 0.3sin30 for that one side in the problem.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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