Answer
$\frac{dy}{dt}=2\ln(9)\times 9^{(2t)}$
Work Step by Step
$y=9^{2t}=e^{2t\times\ln(9)}$
On differentiating both sides:
$\frac{dy}{dt}=2\ln(9)\times e^{2t\times\ln(9)}$
$\frac{dy}{dt}=2\ln(9)\times 9^{(2t)}$
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