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In the plane, the vectors and are given, for which , apply, and the angle between the vectors is equal to . Calculate the scalar product of the vectors and the length of the perpendicular projection of the vector onto the vector .
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and 
are given, for which 
, 
apply, and the angle between the vectors is equal to 
. Calculate the scalar product of the vectors and the length of the perpendicular projection of the vector 
and the perpendicular projection of the vector is 
