Trapezoidal sum: An approximation using trapezoids instead of rectangles: (delta x / 2)[f(x_0) + 2f(x_1) + ... + 2f(x_{n-1}) + f(x_n)].
How to apply it: Use trapezoidal sums for better accuracy; they overestimate when f is concave up and underestimate when concave down.
Course: AP Calculus AB · Unit: Integration and Accumulation of Change
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