et r be a three-dimensional real vector-valued function such that r′′ exists. Show that d/dt [r(t) ×r′(t)] = 1/3 r′′(t) ×−3r(t).

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 69EQ: Let x=x(t) be a twice-differentiable function and consider the second order differential equation...
icon
Related questions
Question

2. Let r be a three-dimensional real vector-valued function such that r′′ exists.
Show that d/dt [r(t) ×r′(t)] = 1/3 r′′(t) ×−3r(t).

Expert Solution
steps

Step by step

Solved in 2 steps

Blurred answer