Differentiation of infinite series

In summary, the derivative of y=✓{x+✓[y+✓(x+...)]}infinite is y'= \frac{y^2- x}{2y^2- 2xy- 1}. This can be obtained by squaring y= \sqrt{x+ \sqrt{y+ \sqrt{x+ \cdot\cdot\cdot}}} and differentiating with respect to x. The original equation is equivalent to y= \sqrt{x+ \sqrt{y+ y}}= \sqrt{x+ \sqrt{2y}}.
  • #1
Ande Yashwanth
2
0
Find derivative of y=✓{x+✓[y+✓(x+...)]}infinite.
Here root comes for total inter terms
 
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  • #2
Ande Yashwanth said:
Find derivative of y=✓{x+✓[y+✓(x+...)]}infinite.
Here root comes for total inter terms
[tex]y= \sqrt{x+ \sqrt{y+ \sqrt{x+ \cdot\cdot\cdot}}}[/tex] is clearly the same as [tex]y= \sqrt{x+ \sqrt{y+ y}}= \sqrt{x+ \sqrt{2y}}[/tex].

Squaring both sides, [tex]y^2= x+ \sqrt{2y}[/tex] so that [tex]y^2- x= \sqrt{2y}[/tex] and, squaring again, [tex]y^4- 2xy^2+ x^2= 2y[/tex] or [tex]y^4- 2xy^2- 2y+ x^2= 0[/tex]. Differentiating that with respect to x, [tex]4y^3y'- 2y^2- 4xyy'- 2y'+ 2x= 0[/tex]. Then [tex]4y^3y'- 4xyy'- 2y'= (4y^2- 4xy- 2)y'= 2y^2- 2x[/tex] so [tex]y'= \frac{y^2- x}{2y^2- 2xy- 1}[/tex].

(Shouldn't this be in "Calculus" rather than "Linear and Abstract Algebra"?)
 

FAQ: Differentiation of infinite series

What is differentiation of infinite series?

Differentiation of infinite series is the process of finding the derivative of each term in an infinite series. It involves finding the rate of change of the terms in the series with respect to a given variable.

Why is differentiation of infinite series important?

Differentiation of infinite series is important because it allows us to analyze and understand the behavior of infinite series. It also helps in solving problems involving infinite series in various fields such as physics, engineering, and economics.

What is the formula for differentiating an infinite series?

The formula for differentiating an infinite series is similar to the formula for differentiating a finite series. Each term in the series is differentiated individually using the power rule, product rule, quotient rule, or chain rule, depending on the form of the term.

Can all infinite series be differentiated?

No, not all infinite series can be differentiated. Some series may not have a derivative that exists or is well-defined. It is important to check for convergence and other conditions before attempting to differentiate an infinite series.

How is differentiation of infinite series related to integration?

Differentiation and integration are inverse operations. Therefore, the process of finding the derivative of an infinite series is closely related to finding the antiderivative, or integral, of the same series. This relationship is known as the Fundamental Theorem of Calculus.

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