Alternative Equation Formats

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MathML

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

Math Rendered as SVG

Math as LaTeX Source

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