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A Differential Equation is a n equation with a function and one or more of its derivatives :. Example: an equation with the function y and its derivative dy dx. In our world things change, and describing how they change often ends up as a Differential Equation:. Think of dN dt as "how much the population changes as time changes, for any moment in time". Let us imagine the growth rate r is 0.

But that is only true at a specific time , and doesn't include that the population is constantly increasing. The bigger the population, the more new rabbits we get!

So it is better to say the rate of change at any instant is the growth rate times the population at that instant:.

And that is a Differential Equation , because it has a function N t and its derivative. And how powerful mathematics is! That short equation says "the rate of change of the population over time equals the growth rate times the population". Differential Equations can describe how populations change, how heat moves, how springs vibrate, how radioactive material decays and much more.

They are a very natural way to describe many things in the universe. On its own , a Differential Equation is a wonderful way to express something, but is hard to use. So we try to solve them by turning the Differential Equation into a simpler equation without the differential bits, so we can do calculations, make graphs, predict the future, and so on. Money earns interest. The interest can be calculated at fixed times, such as yearly, monthly, etc.

But when it is compounded continuously then at any time the interest gets added in proportion to the current value of the loan or investment. Using t for time, r for the interest rate and V for the current value of the loan:. And here is a cool thing: it is the same as the equation we got with the Rabbits! It just has different letters. So mathematics shows us these two things behave the same. But don't worry, it can be solved using a special method called Separation of Variables and results in:.

Where P is the Principal the original loan , and e is Euler's Number. So Differential Equations are great at describing things, but need to be solved to be useful. In Physics, Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement.

An example of this is given by a mass on a spring. The weight is pulled down by gravity, and we know from Newton's Second Law that force equals mass times acceleration:. And acceleration is the second derivative of position with respect to time, so:.

It has a function x t , and it's second derivative d 2 x dt 2. Note: we haven't included "damping" the slowing down of the bounces due to friction , which is a little more complicated, but you can play with it here press play :.

Creating a differential equation is the first major step. But we also need to solve it to discover how, for example, the spring bounces up and down over time. Over the years wise people have worked out special methods to solve some types of Differential Equations.

It is like travel: different kinds of transport have solved how to get to certain places. Is it near, so we can just walk? Is there a road so we can take a car? Or is it in another galaxy and we just can't get there yet? The Order is the highest derivative is it a first derivative? It has only the first derivative dy dx , so is "First Order". This has a second derivative d 2 y dx 2 , so is "Order 2".

This has a third derivative d 3 y dx 3 which outranks the dy dx , so is "Order 3". The degree is the exponent of the highest derivative. Be careful not to confuse order with degree. Some people use the word order when they mean degree! It is Linear when the variable and its derivatives has no exponent or other function put on it. And we have a Differential Equations Solution Guide to help you.

Hide Ads About Ads. There are many "tricks" to solving Differential Equations if they can be solved! But first: why? Why Are Differential Equations Useful? In our world things change, and describing how they change often ends up as a Differential Equation: Example: Rabbits!

The more rabbits we have the more baby rabbits we get. Then those rabbits grow up and have babies too! The population will grow faster and faster. The important parts of this are: the population N at any time t the growth rate r the population's rate of change dN dt Think of dN dt as "how much the population changes as time changes, for any moment in time".

Example: Compound Interest Money earns interest. This is called compound interest. And as the loan grows it earns more interest.

Solving The Differential Equation says it well, but is hard to use. Example: Rabbits Again! Example: Spring and Weight A spring gets a weight attached to it: the weight gets pulled down due to gravity, as the spring stretches its tension increases, the weight slows down, then the spring's tension pulls it back up, then it falls back down, up and down, again and again.

Describe this with mathematics! Derivatives Calculus Index.

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A Differential Equation is a n equation with a function and one or more of its derivatives :. Example: an equation with the function y and its derivative dy dx. In our world things change, and describing how they change often ends up as a Differential Equation:. Think of dN dt as "how much the population changes as time changes, for any moment in time". Let us imagine the growth rate r is 0. But that is only true at a specific time , and doesn't include that the population is constantly increasing.

## differential calculus formulas pdf

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A differential equation is a mathematical equation that relates some function with its derivatives. In applications, the functions usually represent physical quantities, the derivatives represent their rates of change, and the equation defines a relationship between the two. The topics and sub-topics covered in Differential Equations Class 12 Formulas are:.

Microsoft teams app qr code. Let us learn and remember most Important formulas of Integration , tips and tricks to learn algebraic , most important differentiation questions for plus 2 maths, indefinite integration tricks and shortcuts trigonometric and by parts formulas in an easy and short cut manners. Math Formulas Sheet and Integration Techniques Basic MATH S1 1 The following three groups of formulas are the most basic and frequently used formulas in Math , please always keep in mind, especially the underline formulas.

Calculus , originally called infinitesimal calculus or "the calculus of infinitesimals ", is the mathematical study of continuous change, in the same way that geometry is the study of shape and algebra is the study of generalizations of arithmetic operations. It has two major branches, differential calculus and integral calculus ; the former concerns instantaneous rates of change, and the slopes of curves, while integral calculus concerns accumulation of quantities, and areas under or between curves. These two branches are related to each other by the fundamental theorem of calculus , and they make use of the fundamental notions of convergence of infinite sequences and infinite series to a well-defined limit.

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Antiderivatives and Differential Equations Work through some of the examples in your textbook, and compare your solution to the 16 Habits of Mind (1 page summary): biblebelieverspentecostal.org of Mind.pdf.