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Trigonometric Integrals: Example 3: sin(x)^2

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mes4.4 K5 years agoSteemit3 min read

In this video I go over another example on trig integrals and this time solve for the definite integral of sin(x)2 from x = 0 to x = pi. In this example I use the half angle trig identity which I covered in my last video to simplify the integral before solving it.


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Trigonometric Integrals: Example 3

https://cdn.steemitimages.com/DQmbYHXWuLK7mty9j2CfuDpoEbsh3GHWvRwy11qSpqTDgWD/Trigonometric%20Integrals%20Example%203.jpeg

Example:

https://cdn.steemitimages.com/DQmervwqvSA6Ydbc6WqN6vjAhVTWucUaHVKXhQWfxUGGyFu/image.png

Solution:

https://cdn.steemitimages.com/DQmU1khUs7xxK6sy1Jd763Rt2ehXiD8Rmh3MGeWPnrNW7wa/image.png

In my earlier examples, an odd power of sine or cosine enabled us to separate a single factor and convert the remaining even power. For example from my last video:

https://cdn.steemitimages.com/DQmZ6rYBcJQSMwSUhahuEcxueFvJqG1yR6zHfW9Kaw4jwCM/image.png

If the integrand contains even powers of both sine and cosine, this strategy fails. But in this case we can take advantage of the following half-angle identities which I covered in my last video:

https://cdn.steemitimages.com/DQmb7dTv1AFe6hkhx7X9UupHcKz378QDPfTbFgDfzfBNwUV/image.png

https://cdn.steemitimages.com/DQmQ9FYy3L9ZiprBjRgG2GxmYmx5dmcoHiMZQfZeVs71bdv/image.png

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