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I am going through this notes and i would like some clarity on the highlighted part...the earlier steps are pretty easy to follow...

Is there a mistake here...did the author mean taking partial derivative with respect to ##t##? is ##\dfrac{d}{dt}## a mistake? How did that change to next line ##\dfrac{∂}{∂t}##... unless i am the one missing something here. Cheers guys.

Is there a mistake here...did the author mean taking partial derivative with respect to ##t##? is ##\dfrac{d}{dt}## a mistake? How did that change to next line ##\dfrac{∂}{∂t}##... unless i am the one missing something here. Cheers guys.

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