Problem Calculate the acute angle between two intersecting surfaces whose equations are as follows: $$2x - 4y - z = -5$$
$$3x + 4y + 5z = -6$$
Problem Compute the value of b if A and B are orthogonal. $${\bf A} = 2{\bf i} + b{\bf j} + {\bf k}$$
$${\bf B} = 4{\bf i} - 2{\bf j} - 2{\bf k}$$
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