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Show that the straight lines vec(r)=(5ha...

Show that the straight lines `vec(r)=(5hat(i)+7hat(j)-3hat(k))+s(4hat(i)+4hatj-5hat(k))andvec(r)=(8hat(i)+4hat(j)+5hat(k))+t(7hat(i)+hat(j)+hat(k))` are coplanar. Find the vector equation of the plane in which they lie.

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