Find the Principal Unit Normal Vector N for the Curve

question 113

Multiple Choice

Find the principal unit normal vector N for the curve r(t) .
-r(t) = (10 sin t) i + (10 cos t) j + 9k

• A) N = (sin t)i + (cos t)j
• B) N = (-sin t)i + (cos t)j
• C) N = (-sin t)i - (cos t)j
• D) N = (-cos t)i - (sin t)j

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