zeros(expr ⟨,x ⟩)
returns a list of
values of the variable where the expression vanishes. The list may
be incomplete in exact mode if the expression is not a polynomial or
if intermediate factorizations have irreducible factors of order
strictly greater than 2.In real mode, (which means the complex box is unchecked in the CAS
configuration (see Section 2.5.7) or with
complex_mode:=0), only reals zeros are returned. With
(complex_mode:=1), real and complex zeros are returned.
cZeros behaves like zeros, except that it returns
complex zeros whether in real or complex mode.