If $\overrightarrow a \times \overrightarrow b=\overrightarrow c \times \overrightarrow d\: and \: \overrightarrow a \times \overrightarrow c=\overrightarrow b \times \overrightarrow d$ show that $\overrightarrow a-\overrightarrow d$ is parallel to $\overrightarrow b-\overrightarrow c$ where $\overrightarrow a \neq \overrightarrow d\: and \overrightarrow b \neq\overrightarrow c$

Share

Please log in or register to add a comment.