2. Let r(t) be a curve of constant speed defined on the interval [—^,^]. If the unit tangent vector of r(t) at any point is given by T(t) = (sint, cost) and the curve length of r(t) is 4ñ, then the value of r'(π/4) is A. (√2,-√2) B. (-√2/2, √2/2) C. (√2,0) D. (√2/2, √2/2) E. (√2, √2)

2. Let r(t) be a curve of constant speed defined on the interval [—^,^]. If the unit tangent vector of r(t) at any point is given by T(t) = (sint, cost) and the curve length of r(t) is 4ñ, then the value of r'(π/4) is A. (√2,-√2) B. (-√2/2, √2/2) C. (√2,0) D. (√2/2, √2/2) E. (√2, √2)

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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