# Math Help - Derivative

1. ## Derivative

The given limit is a derivative, but of what function f(x) and at what point.

limit as change of x approaches 0 of the (tan(pi/4+change of x)-1)/ change of x.

2. Originally Posted by ocmisssunshine
The given limit is a derivative, but of what function f(x) and at what point.

limit as change of x approaches 0 of the (tan(pi/4+change of x)-1)/ change of x.

the function is f(x) = tan(x), and we are considering the derivative at the point x = pi/4

is that what you wanted?

3. $\lim_{h\rightarrow{0}}\frac{tan(\frac{\pi}{4}+h))-1}{h}$

What is $tan(x)$ when $x=\frac{\pi}{4}$?.

4. No I have to find what function F(x) and at what point from the limit which is a derivative. which is the tan(pi/4+deltax)-1 all divided by delta x

5. the tangent of pi/4 is one

6. Yes. That's what I am getting at. See the 1 in your limit?. The function you wish to find is in front of you.

7. omg I look over the obvious all the time. Thank you so much!! I always make things more complicated then they have to be.