Posted by Elena on Friday, April 22, 2011 at 5:27pm.
Graph a function(any function) from a to x.
I think you mean a is the lower limit and x the upper, but whatever:
The question is what is the change of area under that function for a small change in the upper limit x of dx?
It is in fact the value of the function at x times dx
and d/dx of that is just the value of the function at x
tan [tan(x)]
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