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# Tangent to the line... watch

1. I dont understand the concept here... Normally to find the tangent to f(x), I differentiate f(x)...But in this case I'm given F(x), what do I do? Do I integrate it to get f(x) and then what?

2. Fundametal theorem of calculus:

Let F be a real valued function define on [a,b], set for all x

then
3. (Original post by notnek)
Fundametal theorem of calculus:

Let F be a real valued function define on [a,b], set for all x

then
That's still not helping me, im still confused. Can you do a written explanation please? Thanks in advance
4. (Original post by davidsmith)
That's still not helping me, im still confused. Can you do a written explanation please? Thanks in advance
What part are you confused about?

Look at my last post and ignore the part 'Let F be..' and concentrate on the two equations. Compare the first equation with the integral in the question and you should see that they are similar.

Now tell me what a and f(t) are when comparing. Then use the second equation to work out F'(t). Once you've found this derivative, you can do what you normally do when finding tangent equations.

If you're still confused, please post your working up to the part you are stuck. I'm not going to post a full solution,

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Updated: January 14, 2010
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