# Integrals Example: Trigonometric Substitution: Integral from Catenary Proof

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In this video I go over an example on using trigonometric substitution to evaluate integrals. This example is the same one in my earlier catenary proof video, but which I used an online integral calculator to save time in the derivation. The integral is of the function 1/sqrt(p2 + 1) and I show how it is pretty straight forward to apply the trig substitution p = tan(u) because then we can use trigonometry identities to remove the square root in the integrand. The solution to the integral involves an absolute value, but I also show how in this particular example I show how the function inside the absolute value is always greater than 0, and thus we can remove the absolute value sign! This is a great example on applying the trigonometric substitution as well as in understanding how absolute value functions can be simplified, so make sure to watch this video!

View video notes on the Hive blockchain: https://peakd.com/mathematics/@mes/video-notes-integrals-example-trigonometric-substitution-integral-from-catenary-proof

Related Videos:

Hyperbolic Functions: Catenary: Formula and Proof: https://youtu.be/EYb1p9r1fnM
Trigonometric Substitution for Integrals: http://youtu.be/2pWvGXwtVJo
Trigonometry: Derivative of sec(x): Proof: http://youtu.be/0sO0TehqMOw
Improper Integrals: Example 6: sec(x): https://youtu.be/yHnv2w9OVWk
Trigonometry Identity: tan2(x) + 1 = sec2(x): https://youtu.be/5i3NZ_xip7I .

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