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Find the Angle Between the Two Planes $\begin{array} { l } x + y - z = 3 \\4 x - 5 y - 4 z = 5\end{array}$

Question 106

Multiple Choice

Find the angle between the two planes. $\begin{array} { l } x + y - z = 3 \\4 x - 5 y - 4 z = 5\end{array}$

A) 77.7°
B) 76.7°
C) 79.7°
D) 78.7°
E) 75.7°

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