Prove that: The straight line which passes through the two points \( (4, 3 \sqrt{3}) \) and \( (5, 2\sqrt{3}) \) is perpendicular to the straight line which makes a positive angle of measure \( 30^\circ \) with the positive direction of X-axis.
Proof:
\( m_1 \times m_2 = -1 \)
The two straight lines are perpendicular.
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