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Find the Unit Tangent Vector T and the Principal Unit π\pi

Question 56

Multiple Choice

Find the unit tangent vector T and the principal unit normal vector N.
-r(t) = ( 3 + t) i + ( 7 + ln(sec t) ) j - 3k, - π\pi /2 < t < π\pi /2


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

Correct Answer:

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