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You made me remember my algebra teacher :smile:
When I asked: "Where do logarithms come from? Why are they so important? ". He simply repeated the definition of logarithms :surprised :surprised . Then was the time I really hated math, because I thought math is created just to bother...
I think "The complete idiot's guide to calculus" is exactly what you need.
You can go to Kelly's website www.calculus-help.com and become familiar with the way Micheal Kelly, teaches calculus.
Today I was reading my favorite calculus textbook, that saw the integration formula for tan(x).
It was : Integral of tan(x) = -ln|cosx| + C .
I know that when we say integral of tanx we mean, what is the function whose derivative is tanx. So started to take the derivative of -ln |cosx|, in...