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[itex]\delta = Arctan(\frac{f}{D + d}) - Arctan(\frac{e}{D}) - Arctan(\frac{a - e}{D}) + Arctan(\frac{a - f}{D + d})[/itex]

The assignment now says:

*Choose a = 6.5 cm, D = 40 cm and e = 3.25 cm. Plot the disparity for [itex]f \in [e - 10, e + 10][/itex] (cm) and [itex]d \in [-20, 20][/itex] (cm).*

Does anyone know how I could make such a plot?