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bobsmith76
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Homework Statement
In the following problem they are taking the third derivative, then multiplying a 3 by 3 matrix. I don't understand how they progress from the first to the second to the third deriviative in the following two questions.
These are the parts of the solution that I really don't understand
What's going on? -3 sin t is not the derivative of -3 sin t
The derivative of e^t(cos t - sin t) is (e^t)(-sin t - cos t) not 2e^t sin t
The derivative of e^t(sin t + cos t) is (e^t)(cos t - sin t) not (2e^t)(cos t)
I don't understand.
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