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Ch. 5 - Integration
5์žฅ, ๋ฌธ์ œ 5.R.21

Properties of integrals Suppose โˆซโ‚โด ฦ’(๐“) d๐“ = 6 , โˆซโ‚โด g(๐“) d๐“ = 4 and โˆซโ‚ƒโด ฦ’(๐“) d๐“ = 2 . Evaluate the following integrals or state that there is not enough information.


โˆซโ‚ยณ ฦ’(๐“)/g(๐“) d๐“

๊ฒ€์ฆ๋œ ๋‹จ๊ณ„๋ณ„ ์•ˆ๋‚ด
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Step 1: Begin by analyzing the given information. You are provided with the values of three definite integrals: โˆซโ‚โด ฦ’(๐“) d๐“ = 6, โˆซโ‚โด g(๐“) d๐“ = 4, and โˆซโ‚ƒโด ฦ’(๐“) d๐“ = 2. These represent the areas under the curves of ฦ’(๐“) and g(๐“) over specific intervals.
Step 2: Use the property of definite integrals that allows splitting the integral over an interval into subintervals. Specifically, โˆซโ‚โด ฦ’(๐“) d๐“ = โˆซโ‚ยณ ฦ’(๐“) d๐“ + โˆซโ‚ƒโด ฦ’(๐“) d๐“. Substitute the known values: 6 = โˆซโ‚ยณ ฦ’(๐“) d๐“ + 2. Solve for โˆซโ‚ยณ ฦ’(๐“) d๐“, which gives โˆซโ‚ยณ ฦ’(๐“) d๐“ = 4.
Step 3: Recognize that the integral โˆซโ‚ยณ ฦ’(๐“)/g(๐“) d๐“ involves the division of two functions ฦ’(๐“) and g(๐“). However, the given information only provides the integrals of ฦ’(๐“) and g(๐“) separately, not their quotient. This means you cannot directly compute the integral of their division using the provided data.
Step 4: State that there is not enough information to evaluate โˆซโ‚ยณ ฦ’(๐“)/g(๐“) d๐“. To compute this integral, you would need either the explicit forms of ฦ’(๐“) and g(๐“) or additional information about their behavior over the interval [1, 3].
Step 5: Conclude that while the properties of integrals allow manipulation of sums and differences, they do not extend to the division of functions without further details. Therefore, the integral โˆซโ‚ยณ ฦ’(๐“)/g(๐“) d๐“ cannot be evaluated with the given data.

๋น„์Šทํ•œ ๋ฌธ์ œ์— ๋Œ€ํ•œ ๊ฒ€์ฆ๋œ ์˜์ƒ ๋‹ต๋ณ€:

์ด ์˜์ƒ ํ•ด๋ฒ•์€ ์œ„ ๋ฌธ์ œ์— ๋„์›€์ด ๋œ๋‹ค๊ณ  ํŠœํ„ฐ๋“ค์ด ์ถ”์ฒœํ•œ ๊ฒƒ์ž…๋‹ˆ๋‹ค.
์˜์ƒ ๊ธธ์ด:
3m
๋„์›€์ด ๋˜์—ˆ๋‚˜์š”?

์ฃผ์š” ๊ฐœ๋…

์งˆ๋ฌธ์— ์˜ฌ๋ฐ”๋ฅด๊ฒŒ ๋‹ตํ•˜๊ธฐ ์œ„ํ•ด ๋ฐ˜๋“œ์‹œ ์ดํ•ดํ•ด์•ผ ํ•˜๋Š” ํ•ต์‹ฌ ๊ฐœ๋…๋“ค์€ ๋‹ค์Œ๊ณผ ๊ฐ™์Šต๋‹ˆ๋‹ค.

Properties of Definite Integrals

Definite integrals have several key properties, including linearity, which states that the integral of a sum is the sum of the integrals, and the ability to split integrals over adjacent intervals. For example, โˆซโ‚แต‡ f(x) dx can be expressed as โˆซโ‚แต— f(x) dx + โˆซโ‚œแต‡ f(x) dx for any t in [a, b]. Understanding these properties is crucial for evaluating integrals and manipulating them effectively.
์ถ”์ฒœ ์˜์ƒ:
๊ฐ€์ด๋“œ ์ฝ”์Šค
05:43
Definition of the Definite Integral

Integration of Functions

Integration is the process of finding the area under a curve represented by a function over a specified interval. The integral โˆซ f(x) dx gives the accumulated value of f(x) from a to b. In this context, knowing how to evaluate integrals of specific functions and their relationships is essential for solving the given problem involving ฦ’(x) and g(x).
์ถ”์ฒœ ์˜์ƒ:
05:11
Integrals of General Exponential Functions

Ratio of Functions in Integrals

When dealing with the integral of a ratio of functions, such as โˆซ f(x)/g(x) dx, it is important to consider the behavior of both functions over the interval of integration. If g(x) is non-zero and continuous, the integral can often be evaluated using techniques like substitution or partial fractions. However, if g(x) approaches zero, the integral may be undefined or require special consideration.
์ถ”์ฒœ ์˜์ƒ:
05:11
Integrals of General Exponential Functions
๊ด€๋ จ ์‹ค์ฒœ
๊ต๊ณผ์„œ ์งˆ๋ฌธ

Evaluating integrals Evaluate the following integrals.


โˆซโ‚‹โ‚‚ยฒ (3๐“โดโ€•2๐“ + 1) d๐“

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๊ต๊ณผ์„œ ์งˆ๋ฌธ

(b) Find the average value of ฦ’ shown in the figure on the interval [2,6] and then find the point(s) c in (2, 6) guaranteed to exist by the Mean Value Theorem for Integrals. 

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๊ต๊ณผ์„œ ์งˆ๋ฌธ

Area of regions Compute the area of the region bounded by the graph of ฦ’ and the ๐“-axis on the given interval. You may find it useful to sketch the region.                                              

                                                                                                                                                                                    

 ฦ’(๐“) = 2 sin ๐“/4 on [0, 2ฯ€]

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๊ต๊ณผ์„œ ์งˆ๋ฌธ

Area by geometry Use geometry to evaluate the following definite integrals, where the graph of ฦ’ is given in the figure.

(c) โˆซโ‚…โท ฦ’(๐“) d๐“

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๊ต๊ณผ์„œ ์งˆ๋ฌธ

Evaluating integrals Evaluate the following integrals.                                                                                                                                         

                                                                                                                                                                    

 โˆซ ๐“โท โˆš(๐“โด + 1d๐“)

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๊ต๊ณผ์„œ ์งˆ๋ฌธ

Evaluating integrals Evaluate the following integrals.


โˆซโ‚แต‰ d๐“ / [๐“(1 + ln ๐“)]

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