Homework Help: Calculus

Posted by Corin on Monday, September 3, 2007 at 1:42am.

I need to find the slope of the graph of the function at the given point.

Function:
f(theta)=4sin(theta)-(theta)

Point:
(0,0)

I tried finding the derivative of the function at theta=0, but I got 0 for an answer.

I checked the answer in the back of my book and it is 3.

I just need to figure out how to get there.

Thanks to anyone who tries to help me.

--Cori

Calculus - drwls, Monday, September 3, 2007 at 2:17am
The derivative of f(theta) is
f'(theta) = 4 cos(theta) -1
When theta = 0, the value of the derivative is 4 -1 = 3.
- Calculus - Corin, Monday, September 3, 2007 at 2:25am
  Only one question: How did you get -1 from -theta ?
  
  Thanks so much!
Calculus - drwls, Monday, September 3, 2007 at 5:37am
The derivative of f(thetha) = theta is
f'(theta) = df/d(theta) = 1. It's the same thing as saying the derivative of
f(x) = x is f'(x) = 1.
- Calculus - Corin, Monday, September 3, 2007 at 6:36pm
  Thanks so much. I get it now.

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