Beta function integration

61 Views Asked by At

Calculate the integration : $$ I=\int_0^{\pi/2}\sin^{a-1}\phi\cos^{b-1}\phi\,d\phi $$ I need help about this! Please!

1

There are 1 best solutions below

0
On

Hint:

Understand the connection between

$$\sin^{a-1}(\phi)\cos^{b-1}(\phi)$$

and

$$t^{p-1}(1-t)^{q-1}.$$

Second hint: $$\cos^2(\phi)=1-\sin^2(\phi).$$