limits are nice... expecially l'hospitals (pronounced: lo pee tals) rule. that rule can get you a limit on specific functions even if you can't see to find one using any conventional methods.
derivitives can be cool... depending on what you have to take the derivitive of, then it can be a pain in the ass... find the derivitive of y with respect to x is what it means y = (ln(tan(x)sec(x)))^3
so overall, math isn't bad, but calculus you really have to understand and like to do good at...
and by the way, the answer to the question in paragraph 2 is:
y' = (3(ln(tan(x)sec(x)))^2) * (1/(tan(x)sec(x))) * (sec^2(x)sec(x)tan(x))
simplify:
y' = (3(ln(tan(x)sec(x)))^2) * (sec^2(x))