Integral from 0 to 1 of 1/sqrt(1+x^2)

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In summary, the integral from 0 to 1 of 1/sqrt(1+x^2) represents the arc length of the hyperbolic function y = sinh(x) and can be solved using substitution. Its graphical representation is a positively skewed curve with various applications in physics, engineering, and mathematics. It can also be solved using geometric methods, but substitution is the most common and efficient approach.
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Homework Statement


[tex]\int_0^1 \frac{1}{\sqrt{x^2+1}}\,dx[/tex]

Homework Equations


Integration by substitution looks like it might help here...

The Attempt at a Solution


The answer is [tex]\log (1+\sqrt 2)[/tex], but I'm at a loss as to how to derive that.
 
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You could try a trig substitution such as [itex]x=tan\theta[/itex].Hyperbolic trig sub. would be possible as well.
 
  • #3
Thanks. I worked it out using your suggestion, but x = sinh(theta) also works, in case anyone cares. :-)
 

FAQ: Integral from 0 to 1 of 1/sqrt(1+x^2)

What is the significance of the integral from 0 to 1 of 1/sqrt(1+x^2)?

The integral from 0 to 1 of 1/sqrt(1+x^2) is a mathematical representation of the arc length of the hyperbolic function y = sinh(x) from 0 to 1. It is often used in physics and engineering to calculate the distance traveled by a particle moving along a curved path with a varying speed.

How is the integral from 0 to 1 of 1/sqrt(1+x^2) calculated?

The integral from 0 to 1 of 1/sqrt(1+x^2) can be solved using a technique called substitution. By substituting u = 1+x^2, the integral can be rewritten as 1/2 times the integral of 1/u^(1/2) which can be easily solved using basic integration rules.

What is the graphical representation of the integral from 0 to 1 of 1/sqrt(1+x^2)?

The graphical representation of the integral from 0 to 1 of 1/sqrt(1+x^2) is a curve that approaches infinity as it approaches the end points of the interval. It is a positively skewed curve with a peak at x = 0 and asymptotes at x = 1 and x = -1.

What are the applications of the integral from 0 to 1 of 1/sqrt(1+x^2)?

The integral from 0 to 1 of 1/sqrt(1+x^2) has various applications in physics, engineering, and mathematics. It is used to calculate the length of a curve, the work done by a force on a particle moving along a curved path, and the speed of a particle at a specific point in time.

Can the integral from 0 to 1 of 1/sqrt(1+x^2) be solved using other methods?

Yes, the integral from 0 to 1 of 1/sqrt(1+x^2) can also be solved using geometric methods such as the Pythagorean theorem or trigonometric substitutions. However, using substitution is the most common and efficient method for solving this integral.

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