0, other

F(z)= (from negative infinite integral to positive infinity) 3 | x | f (x, 3xz) dx,-1 ≤ x ≤ 1, 0 ≤ 3xz.

When x & gt0f (z) = (an integer from 0 to 1) (3x/2)dx, 0≤z≤ 1/3.

(Integer from 0 to 65438 +0/(3z))(3x/2)dx, z> 1/3

=3/4，0≤z≤ 1/3

1/( 12z^2)，z & gt 1/3

X<0 is similar (because |x| is an even function).

f(z)=3/4，|z|≤ 1/3

1/( 12z^2)，|z| > 1/3