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LaTeX code:
\vec{F} = \frac{d \vec{p}}{dt} = m \frac{d \vec{v}}{dt} = m \vec{a}

Equation rendering with VisualMathEditor configuration MathJax file: $$\vec{F} = \frac{d \vec{p}}{dt} = m \frac{d \vec{v}}{dt} = m \vec{a}$$