Alternative Equation Formats

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MathML

\begin{aligned} \frac{\partial^{2} f}{\partial θ_{i} \partial θ_{j}} & \approx \frac{g_{i} (θ + h_{j} e_{j}) - g_{i} (θ - h_{j} e_{j})}{4 h_{j}} + \frac{g_{j} (θ + h_{i} e_{i}) - g_{j} (θ - h_{i} e_{i})}{4 h_{i}} \end{aligned}

Math Rendered as SVG

Math as LaTeX Source

\begin{align*} \frac{\partial ^2 f}{\partial \theta _ i \partial \theta _ j} & \approx \frac{g_ i(\btheta + h_ j\mb{e}_ j) - g_ i(\btheta - h_ j\mb{e}_ j)}{4h_ j} + \frac{g_ j(\btheta + h_ i\mb{e}_ i) - g_ j(\btheta - h_ i\mb{e}_ i)}{4h_ i} \end{align*}