- What is the derivative of y=tan^-1?

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Find the first and second derivatives of the function p=((q^2+3)/12q)((q^4-1)/q^3)? Aln (x) +b ln (y) =......................? How many mice can I have in a 10 gallon tank? I just heard there is only 5000 blue whales left? What the heck is human kind doing to Earth's ecosystem?? Find the power of 5 that occurs in the factorization of 10! = 10 · 9 · 8 · · · 2 · 1.
What about 100! = 100 · 99 · 98 · · · 2 ·1?