Answer
True
Work Step by Step
From the Theorem 9.8.2 we have:
$\frac{d}{dt}(e^{At})=\frac{d}{dt}(1+At+\frac{(At)^2}{2!}+....)=Ae^{At}$
The derivative of the matrix exponential function $e^{At}$ with respect to the variable $t$ is $Ae^{At}$$
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