I've worked through a long substitution question and have come to this point.
t^2(du/dt) = 2te^(-u)
I know I have to integrate both sides but am struggling with how to do it?!
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Let's start by cancelling t from both sides,
Now we'll isolate the derivative as this may be separable.
Seems we can now separate so,
Neatening up a little
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