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Answers for “什么是微积分基本定理?”

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The fundamental theorem relates accumulation and rate of change by stating that if F′(x)=f(x)F'(x) = f(x), then the accumulated area A(x)A(x) from a fixed point aa to xx is given by A(x)=F(x)−F(a)A(x) = F(x) - F(a). It shows that differentiation and integration are inverse processes: the derivative of the accumulation function A(x)A(x) recovers the integrand f(x)f(x), and antiderivatives allow the evaluation of definite integrals.

Conditions: The function ff is continuous.; FF is an antiderivative of ff (i.e., F′=fF' = f).

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The accumulation function A(x)A(x) defines area by integrating from a fixed lower endpoint to a variable upper endpoint xx. For x≥0x \ge 0, this represents ordinary geometric area.

Conditions: The lower endpoint is fixed.; The upper endpoint xx is variable.; Signed integration is used to handle direction and negative values.

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The accumulation idea applies to motion by integrating velocity over time. Integrating signed velocity gives net displacement, while integrating the absolute value of velocity gives total distance traveled.

Conditions: The variable of integration is time.; The integrand is velocity (signed or absolute).

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To evaluate ∫23xdx\int_2^3 \sqrt{x} dx, first find the antiderivative 23x3/2\frac{2}{3}x^{3/2}. Then, apply the Fundamental Theorem of Calculus by subtracting the value of the antiderivative at the lower bound from its value at the upper bound: [23x3/2]23=23(3)3/2−23(2)3/2\left[\frac{2}{3}x^{3/2}\right]_2^3 = \frac{2}{3}(3)^{3/2} - \frac{2}{3}(2)^{3/2}.

Conditions: The integral is ∫23xdx\int_2^3 \sqrt{x} dx.; The antiderivative is 23x3/2\frac{2}{3}x^{3/2}.; The bounds are 2 and 3.

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The argument places strips of height 2πr2\pi r along the radius axis, forming a Riemann sum. As the maximum partition width tends to zero, these sums approach the area beneath the linear circumference function.

Conditions: The partition is refined such that the maximum width tends to zero.; The circumference function 2πr2\pi r is treated as the height of the strips.

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To verify an antiderivative, you differentiate the proposed result. If the derivative of the proposed function equals the original integrand, then the proposal is correct.

Conditions: The proposed function is differentiable.; The original integrand is defined on the domain of interest.

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The indefinite integral of x2x^2 yields a family of functions F(x)=x33+CF(x) = \frac{x^3}{3} + C. By defining the accumulation function A(x)A(x) such that A(0)=∫00t2dt=0A(0) = \int_0^0 t^2 dt = 0, we impose an initial condition.

Conditions: Integrand is f(t)=t2f(t) = t^2; Lower limit of integration is 0; Accumulation starts from zero