44
The formula $(\overrightarrow{\mathbf{a}}+\overrightarrow{\mathbf{b}})^2=\overrightarrow{\mathbf{a}}^2+\overrightarrow{\mathbf{b}}^2+2 \overrightarrow{\mathbf{a}} \times \overrightarrow{\mathbf{b}}$ is valid for non-zero vectors $\overrightarrow{\mathbf{a}}$ and $\overrightarrow{\mathbf{b}}$.
A
TRUE
B
FALSE
45
If $\overrightarrow{\mathbf{a}}$ and $\overrightarrow{\mathbf{b}}$ are adjacent sides of $\mathbf{a}$ rhombus, then $\overrightarrow{\mathbf{a}} \cdot \overrightarrow{\mathbf{b}}=0$
A
TRUE
B
FALSE