TrapezoidalSum Command

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TrapezoidalSum[ <Function>, <Start x-Value>, <End x-Value>, <Number of Trapezoids> ]
Calculates the trapezoidal sum of the function in the interval [Start x-Value, End x-Value] using n trapezoids.
Example:
TrapezoidalSum[x^2, -2, 3, 5] yields 12.5.
Notes:
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