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§4.4 The Fundamental Theorem of Calculus

如何在不取黎曼和的极限的情况下求出定积分的精确值?

1. Introduction

Introduction

2. The Fundamental Theorem of Calculus

The Fundamental Theorem of Calculus

3. Basic antiderivatives

Basic antiderivatives

4. The total change theorem

The total change theorem

5. Integral of sine over a quarter period

Evaluate ∫0π2sin⁡(x) dx\int_0^{\frac{\pi}{2}}\sin(x)\,dx.

6. The exponential integral

Using the fact that the exponential is its own antiderivative, evaluate ∫01ex dx\int_0^1 e^x\,dx.

7. Odd symmetry kills the integral

Use symmetry of the fifth power to evaluate ∫−11x5 dx\int_{-1}^{1}x^5\,dx without any computation.

8. Meaning of a leak rate integral

A tank leaks at r(t)r(t) gallons per day. The quantity ∫410r(t) dt\int_4^{10} r(t)\,dt and its companion 16∫410r(t) dt\frac{1}{6}\int_4^{10} r(t)\,dt measure

9. When instantaneous meets average

A workout burns calories at a continuous rate c(t)c(t) with average rate 856\frac{85}{6} calories per minute on [0,40][0,40]. Solving c(t)=856c(t) = \frac{85}{6} finds times near 5.9185.918 and 34.08234.082 minutes, guaranteed to exist because

10. Root and square difference

Evaluate ∫01(x−x2) dx\int_0^1(\sqrt{x} - x^2)\,dx as a fraction.

11. Water balloon maximum height

A balloon tossed from 3232 feet with v(t)=−32t+16v(t) = -32t + 16 has position s(t)=−16t2+16t+32s(t) = -16t^2 + 16t + 32. Compute its maximum height in feet.

12. Distance from a fast rocket window

An object moves with v(t)=3t2+40v(t) = 3t^2 + 40 feet per second. Compute the exact distance traveled on [1,5][1,5], using antiderivative t3+40tt^3 + 40t.

13. Falling line integral by the FTC

Using the antiderivative 2x−x22x - x^2, evaluate ∫−14(2−2x) dx\int_{-1}^{4}(2 - 2x)\,dx.

14. A mixed polynomial exponential integral

Evaluate ∫02(3x3−2x2−ex) dx\int_0^2 (3x^3 - 2x^2 - e^x)\,dx with antiderivative 34x4−23x3−ex\frac{3}{4}x^4 - \frac{2}{3}x^3 - e^x, rounded to three decimals.

15. A four term integral

Evaluate ∫01(x3−x−ex+2) dx\int_0^1 (x^3 - x - e^x + 2)\,dx with antiderivative 14x4−12x2−ex+2x\frac{1}{4}x^4 - \frac{1}{2}x^2 - e^x + 2x, rounded to three decimals.

16. Trig with a squared secant

Evaluate ∫0π/3(2sin⁡t−4cos⁡t+sec⁡2t−π) dt\int_0^{\pi/3} (2\sin t - 4\cos t + \sec^2 t - \pi)\,dt with antiderivative −2cos⁡t−4sin⁡t+tan⁡t−πt-2\cos t - 4\sin t + \tan t - \pi t, rounded to three decimals.

17. Calories in the opening stretch

With burn rate c(t)=−0.05t2+t+10c(t) = -0.05t^2 + t + 10 calories per minute on [0,10][0,10], compute the total calories burned, rounded to three decimals.

18. Average burn over the workout

The full workout's integral totals 17003\frac{1700}{3} calories over 4040 minutes. Compute the average burn rate, rounded to three decimals.

19. Total change theorem

If CC is an antiderivative of a calorie burn rate c(t)c(t), then C(40)−C(0)=∫040c(t) dtC(40) - C(0) = \int_0^{40}c(t)\,dt is the total calories burned on [0,40][0,40].

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