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Given two vectors vec(A)=3hat(i)+hat(j)+...

Given two vectors `vec(A)=3hat(i)+hat(j)+hat(k)` and `vec(B)=hat(i)-hat(j)-hat(k)`.Find the
a.Area of the triangle whose two adjacent sides are represented by the vector `vec(A)` and `vec(B)`
b.Area of the parallelogram whose two adjacent sides are represented by the vector `vec(A)` and `vec(B)`
c. Area of the parallelogram whose diagnoals are represented by the vector `vec(A)` and `vec(B)`

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