Need help with my math lab here are the few i am having trouble with please help

Need help with my math lab here are the few i am having trouble with please help

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1.) If the electric current, is the derivative of the charge q, and q’=  = , find the charge in terms of the variable t.

2.)An inductor in an electric circuit  for a 4 H inductor. Find the current in the circuit after 10 seconds.

Find a Maclaurin Series approximation for f(x) = cos(6x) where n = 5.

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