In \(\triangle ABC, \) if

\[a^4 + b^4 + c^4 = 2c^2\big(a^2 +b^2\big), \]

then the possible measure(s) of \(\angle C\) could be \(\text{__________}.\)

\(\)

**Details and Assumptions:**

\(a,b,c\) are the sides of \(\triangle ABC\) opposite to \(\angle A , \angle B, \angle C\) respectively.

\(\angle C\) is measured in

**radians**.

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