Measure Trapezoidal Rule

The trapezoidal rule approximates a definite integral by replacing curve sections with trapezoids.

Formula: Tₙ = (h/2)[f(x₀)+2Σf(xᵢ)+f(xₙ)], h=(b−a)/n

Calculus results depend on the function and the conditions around it. A limit, derivative, or integral should therefore be read together with its point or bounds.

The stated formula is a compact audit of what the calculator is evaluating, which makes it easier to check the output independently.