Differentiate Equations Help: f(x) = e^(−x/2) cos(2x)

Looking some help to Differentiate this equation

f(x) = e^(−x/2) cos(2x)
What do you get when you differentiate e^x? How about when you differentiate e^(-x)? How about e^(x/2)? And e^(-x/2)?

What do you get when you differentiate cos(x)? How about when you differentiate cos(2x)?

What do you get when you apply the Product Rule to the original function?

Please be complete, so we can see where things are going sideways, and provide suggestions. Thank you! ;)
 
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