Задание 
Определи угол между векторами, расположенными в кубе.
\(\widehat{\left(\overrightarrow{A_1B_1} \,\overrightarrow{DC}\right)}=\) [ ]\(\degree\);
\(\widehat{\left(\overrightarrow{A_1D} \,\overrightarrow{CB_1}\right)}=\) [ ]\(\degree\);
\(\hat{\left({\overrightarrow{D_1B_1} \,\overrightarrow{DA}}\right)}=\) [ ]\(\degree\);
\(\widehat{\begin{pmatrix} \overrightarrow{BC} \, \overrightarrow{CA} \end{pmatrix}} =\) [ ]\(\degree\).