1.

Which of the following is the correct formula for the angle between two planes?

A. cos u2061 = ( left | frac{ vec{n_1}. vec{n_2}}{| vec{n_1}|| vec{n_2}|} right | )
B. sin u2061 = ( left | frac{ vec{n_1}. vec{n_2}}{| vec{n_1}|| vec{n_2}|} right | )
C. cos u2061 = ( left | frac{ vec{n_1}+ vec{n_2}}{| vec{n_1}|| vec{n_2}|} right | )
D. sin u2061 = ( left | frac{ vec{n_1}+ vec{n_2}}{(| vec{n_1}|+| vec{n_2}|} right | )
Answer» B. sin u2061 = ( left | frac{ vec{n_1}. vec{n_2}}{| vec{n_1}|| vec{n_2}|} right | )


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