Which of the following function is not called the Euler’s integral of the first kind?

[answerhappygod]

a) \(\beta(m, n) = \int_0^1 x^{m-1} (1-x)^{n-1} dx (m>0, n>0) \)
b) \(\beta(m, n) = \int_0^{π/2} (sin⁡θ)^{2m-1} (cos⁡θ)^{2n-1} dθ \)
c) \(\beta(m, n) = \int_0^∞ \frac{y^{n+1}}{(1+y)^{m+n}} dy \)
d) \(\beta(m, n) = 2 \int_0^{π/2} (sinθ)^{2m-1} (cos⁡θ)^{2n-1} dθ \)