For X∼Weibull(k=2,λ=1)X \sim Weibull(k=2, \lambda=1)X∼Weibull(k=2,λ=1), what is the PDF f(x)f(x)f(x)?
2xe−x22x e^{-x^2}2xe−x2
x2e−xx^2 e^{-x}x2e−x
e−2xe^{-2x}e−2x
2x2e−x22x^2 e^{-x^2}2x2e−x2