If a , b , c are vectors such that a + b + c =0 and | a |=7,| b |=5,| c |=3 , then the…

If \(\vec{a}, \vec{b}, \vec{c}\) are vectors such that \(\overrightarrow{\mathbf{a}}+\overrightarrow{\mathbf{b}}+\overrightarrow{\mathbf{c}}=0 \text { and }|\overrightarrow{\mathbf{a}}|=7,|\overrightarrow{\mathbf{b}}|=5,|\overrightarrow{\mathbf{c}}|=3\), then the angle between vector \(\overrightarrow{\mathrm{b}} \text { and } \overrightarrow{\mathrm{c}} \text { is }\)