So, these holidays zoomed by..umm, this time i'll explain some frequently missed things..
For one, i'll explain the chain rules.
cos(4x^2)
you have to start with the outtermost first, then innermost..
so take the derivative of cos, which is -sin, and then the derivative of the inside quantity, 4x^2, 8x
= -sin(8x)
Now, lets review some limit rules.
WHEN THE LIMIT IS APPROACHING INFINITY:
top degree < bottom degree = zero
top degree > bottom degree = positive or negative infinity
top degree = bottom degree = divided coefficiants
WHEN THE LIMIT IS APPROACHING A NUMBER:
1. factor out the top and bottom
2. look for cancellations
3. plug in the number
Hopefully this was a good review for everyone..its seems to the the things i commonly miss..
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I think I need to print this out or tattoo it to my forehead.
ReplyDeleteit was plain and simple English and I applaud you!!
I especially needed the help with the chain rule, but what if you have say + or - or X terms?