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Use a Calculator to Find the Acute Angle Between the Planes

Question 18

Multiple Choice

Use a calculator to find the acute angle between the planes to the nearest thousandth of a radian.
-4x - 4y + 9z = -10 and -5x - 3y + 7z = 10

A) 0.967 rad
B) 1.478 rad
C) 0.604 rad
D) 0.196 rad

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