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### Finding zeros of zeta function.

I am trying to make the following code work.

t = var('t')
f = zeta(1/2+i*t).abs()
ff = fast_callable(f, vars=[t], domain=CDF)
print find_root(ff, 0, 40)


There are actually 6 roots between 0 and 40. But find_root could not find any of them. Is there any walkaround?