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olivia333
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Homework Statement
Find the unit tangent vector at the indicated point of the vector function
r(t) = e(19t)costi + e(19t)sintj + e(19t) kT(pi/2) = <___i+___j+___k>
Homework Equations
r'(t) / |r'(t)|
The Attempt at a Solution
Answers:19e(19*∏/2)(cos(∏/2)-sin(∏/2)) / ((19e(19*∏/2)sin(∏/2))2+(19e(19*∏/2)cos(∏/2))2+(19e(19*∏/2))2)^.5 i
19e(19*∏/2)(cos(∏/2)+sin(∏/2)) / ((19e(19*∏/2)sin(∏/2))2+(19e(19*∏/2)cos(∏/2))2+(19e(19*∏/2))2)^.5 j (correct)
19e(19*∏/2) / ((19e(19*∏/2)sin(∏/2))2+(19e(19*∏/2)cos(∏/2))2+(19e(19*∏/2))2)^.5 k (correct)
What's wrong with i?
Thanks!
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