The upper limit of LIM [∫ sin (T ^ 2) DT] / (x ^ 6 + x ^ 7) is (1-cosx), and the lower limit is 0

First use lobita, the equivalent infinitesimal constantly change. Pay attention to some skills
Da an 1 / 20
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Lim → 0 {1 / ln (1 + x) [∫ (upper limit x, lower limit 0) cost ^ 2 DT

Ln (1 + x) is replaced by the equivalent infinitesimal x, and then by the law of lobita, we get
The original formula = Lim [x → 0] cosx & # / 1 = 1
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Given that the solution set of inequality AX2 + BX + C > 0 about X is (- 1 / 3,1 / 2), find the solution set of inequality CX2 + BX + a < 0 about X

It is known that x = - 1 / 3 and x = 1 / 2 are original expressions of 0, and then x = - 1 / 3 and x = 1 / 2 are introduced to obtain a / 9-b / 3 + C = 0 and a / 4 + B / 2 + C = 0. The above two expressions are solved to obtain a = - 6B = - 6C. If a is negative, then B = C = positive, then CX2 + BX + A is a quadratic process with an opening upward

Can you tell me ____________ ? A.what your name is B.What is your name?

Because it doesn't appear as a single question, but after the question, it is in the form of a statement

After adding 3cm to the two adjacent sides of a square, we get a new square. The area of the new square is 39 square centimeters larger than that of the original square. What's the area of the original square?

Let the side length of the original square be x cm. According to the meaning of the question, we can get: 3x + 3x + 3 × 3 = 39 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 6x + 9 = 39 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 6x = 30 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 5 the area of the original square: 5 × 5 = 25 (square centimeter) a: the area of the original square is 25 square centimeter

Can comparative Adjective + than + comparative element be the third person plural

U can do better than them

In △ ABC, the opposite sides of internal angles a, B and C are a, B and C respectively. It is known that a, B and C are in equal proportion sequence, and CoSb = 34. If BA · BC = 32, find the values of s △ ABC and a + C

∵ BA · BC = 32, ∵ accosb = 32 ∵ CoSb = 34 ∵ AC = 2 ∵ B2 = AC = 2. According to the cosine theorem, B2 = A2 + c2-2accosb ∵ A2 + C2 = 5, that is, (a + C) 2-2ac = 5 ∵ a + C = 3 ∵ SINB = 74 ∵ s △ ABC = 12acsinb = 12 × 2 × 74 = 74

Find out the usage of "present continuous tense" and "general present tense"

What is the concept of scientific outlook on development? What is the connotation and theory of scientific outlook on development?

The concept of scientific outlook on Development
Everyone should understand that the eternity, universality and uniqueness of civilization is science, and then understand that the continuity of strategy is development, and development is innovation. We regard the brain's abstract snapshot of science and development as a concept, which is the concept of scientific outlook on development
Scientific development view is "one view and two theories"
——"One view" is the scientific outlook on development, "two views" are the theory of "all win" and the third view
1、 Scientific outlook on Development
2、 On the principle of "all win"
3、 On the third space
This is the structural feature of the scientific outlook on development
According to people's habit of understanding the physical world, one is particles, two are blocks, and three are entities. The scientific outlook on development is not only an entity, but also a game entity. This is in line with the mechanism of human understanding of nature, and can be felt and accepted by people
More and more people have linked the future of the scientific outlook on development with themselves and studied the concept of justice. In the past century, many politicians have been exchanging the eastern and Western theme cultures in the history of right and wrong. Westernization, Oriental thought and modern theory have perfected the scientific outlook on development in various forms. The gene structure of the theme culture of the scientific outlook on development is one view and two theories, This ternary structure is very complete. In the future, when we tell the story of the scientific outlook on development, we will explain it with the theory of justice and the theory of the third space in nature
According to the Game Bible, after careful analysis, we can deeply understand that this is dialectic and innovation in natural science. The relativistic national orthodoxy is a bridge connecting the two worlds, The third open space in the middle symbolizes an innovative and beautiful world. It is the art center of profound reality, where the most profound spiritual reality is the infinite possibility of creating game structure, All creation is the result of game. The more empty the third open space in the game between human and nature, human and society, human and background, the more infinite potential there is, and the invisible self-worth exists there, Their energy and information can be transmitted and balanced in the ternary structure of one view and two theories. The positive principle Win-win Theory of the scientific outlook on development is based on the spontaneous characteristics of heat flow and the overall planning of heat expansion and cold contraction, that is, to use the national theory to carry out the win-win distribution in the third space. The positive principle Win-win Theory of the scientific outlook on development shows that people can see a civilized and harmonious society full of humanity and friendship
The scientific outlook on development reveals the most civilized progress of mankind. It is a harmonious concept of security, prosperity, equality and win-win.the harmonious society established by "one outlook and two theories" keeps people's behavior in step with nature and is not influenced by nature and others. Only in this way can it meet the great strategic goal of the scientific outlook on development
Four characteristics of the scientific outlook on Development
1. The scientific outlook on development awakens the characteristics of innovation gene
2. The characteristics of the structure of "one view and two theories" in the scientific outlook on development
3. The characteristics of the scientific outlook on development in femtosecond

In a series AC circuit with resistors, inductors and capacitors, the voltage on the inductor may be higher than the supply voltage?

When the circuit is opened and closed instantaneously, the self induced electromotive force on the inductor is very large, and the voltage of the inductor is superimposed by the capacitor charging and discharging, the voltage may be higher than the supply voltage

The upper limit of LIM [∫ sin (T ^ 2) DT] / (x ^ 6 + x ^ 7) is (1-cosx), and the lower limit is 0