- #1
P3X-018
- 144
- 0
Hi,
I have a function
[tex] f(x) = \frac{\cos(x^2)+x}{x^2+2},\quad x\in[0,3] [/tex]
I have to find the extreme values of the function in in the range [0,3], with Maple, by solving f'(x) = 0. Maple will solve these numerical, and I get 3 values.
[itex]c_1 = 0.5345058769[/itex], [itex]c_2=1.732313261[/itex] and [itex]c_3=2.461303848 [/itex].
Now there is an uncertantity in this, which can be seen, by calculating f'(c), for c1 (which should be a maxima) it is f'(c1) = -2*10^(-10). Surly this value x = c1 most be a little to the right of the true value of the maxima. Now how can I confirm that there isn't anyvalues in a small range around c1, so that [itex] f(c_1-\delta) \gg f(c_1) [/itex] for a very small value of [itex]\delta>0[/itex]?
How can I use elementary Calculus rules/theorems to argument about this?
I have a function
[tex] f(x) = \frac{\cos(x^2)+x}{x^2+2},\quad x\in[0,3] [/tex]
I have to find the extreme values of the function in in the range [0,3], with Maple, by solving f'(x) = 0. Maple will solve these numerical, and I get 3 values.
[itex]c_1 = 0.5345058769[/itex], [itex]c_2=1.732313261[/itex] and [itex]c_3=2.461303848 [/itex].
Now there is an uncertantity in this, which can be seen, by calculating f'(c), for c1 (which should be a maxima) it is f'(c1) = -2*10^(-10). Surly this value x = c1 most be a little to the right of the true value of the maxima. Now how can I confirm that there isn't anyvalues in a small range around c1, so that [itex] f(c_1-\delta) \gg f(c_1) [/itex] for a very small value of [itex]\delta>0[/itex]?
How can I use elementary Calculus rules/theorems to argument about this?