2. (10p) There are two points P1(1,2,2) and P2(-1,1,0) in Cartesian coordinate system. For position vectors R1 and R2, s
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2. (10p) There are two points P1(1,2,2) and P2(-1,1,0) in Cartesian coordinate system. For position vectors R1 and R2, s
2. (10p) There are two points P1(1,2,2) and P2(-1,1,0) in Cartesian coordinate system. For position vectors R1 and R2, solve following problems. (1) Cross product of Ri and R2 (2) Inner angle between R1 and R2 (3) Area of a triangle OP1P2 (4) Circumference of the triangle OP.P2
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