Let r(t) = (t2, 1 – t, 4t). Calculate the derivative of r(t) · a(t) at t = 9, assuming that a(9) = (-7, –2, 2) and a' (9) = (-2, –9, 9) d r(t) · a(t)-9 dt

Advanced Engineering Mathematics
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ISBN:9780470458365
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Chapter2: Second-order Linear Odes
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Let r(t) = (t2,1 – t, 4t). Calculate the derivative of r(t) · a(t) at t = 9,
assuming that a(9) = (-7, -2, 2) and a' (9) = (-2, –9, 9)
d
고r(t)·a(t)\b-9 =D
t=9
dt
Transcribed Image Text:Let r(t) = (t2,1 – t, 4t). Calculate the derivative of r(t) · a(t) at t = 9, assuming that a(9) = (-7, -2, 2) and a' (9) = (-2, –9, 9) d 고r(t)·a(t)\b-9 =D t=9 dt
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