Click to expand... That

1. The problem statement, all variables and given/known lanolips data find the derivative of the function f(x)=arcsec(4x) 2. Relevant equations I think this is a Relevant equations. d/dx[arcsecu]=u'/(|u|( lanolips u 2 -1) 3. The attempt at a solution f'(x)=4/(|4|( 4 2 -1) =1/ 15 I keep getting wrong in my online homework why?
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1. The problem statement, all variables and given/known data find the derivative of the function f(x)=arcsec(4x) 2. Relevant equations I think this is a Relevant equations. d/dx[arcsecu]=u'/(|u|( u 2 -1) 3. The attempt at a solution f'(x)=4/(|4|( 4 2 -1) =1/ 15 I keep getting wrong in my online homework why?
Dick
Click to expand... That's sort of close. But look up the formula again. Isn't the square root part [itex]\sqrt(u^2-1)[/itex] instead of what you have? And when you write something like 4x^2 it's not clear whether you mean (4x)^2 or 4*(x^2). Which do you mean?
Click to expand... Ok, then keep writing it like that. And what about my other question?
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