## Monday Math 44

Now that we know how to find the derivatives of the gamma function, we can also find the partial derivatives of the beta function. We know that
.
Thus
.
We see from the symmetry between x and y that
.

Finding the second partial derivatives, we see first that
.
Similarly,
.

So we just need the mixed partial derivative


These have a number of applications to definite integrals involving logarithms.

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### One Response to “Monday Math 44”

1. Monday Math 45 « Twisted One 151’s Weblog Says:

[…] Math 45 As we noted previously, the derivatives of the beta function can be used in solving various integration problems. First, […]