select the 3D Calculator app. Use the menu button (3 horizontal lines) to open a new file for each problem below. 1. Let u= 3,2, -1) and v= -2,2,3 (20 pts) a) Compute u v and u xv by hand, showing all your work. b) Compute u.v and u xv using GeoGebra. GeoGebra instructions: Use the Vector( ) command to input a vector. So for example, enter the expression "u=vector((3,2,-1))" for vector u . To compute the vector dot and cross products, use the corresponding commands Dot( , ) and Cross( , ). It is best to enter each vector you will use separately and give them a name as shown above with "u=vector((3,2,-1))". Then you can refer to each vector by its letter name when you put it in the dot or cross product command