Question

help with calculus please!! i dont understand the sin/cos in this problem

Answer 1

"estimate"... Do you have the value of delta given?

Answer 2

\[f'(x)\approx\frac{\Delta f(x)}{\Delta x}\]

Answer 3

no it just gives me that question

Answer 4

so its sinx/x?

Answer 5

@kc_kennylau

Answer 6

sinx becomes cos x right?

Answer 7

But it says estimate...

Answer 8

If you do cos(0) it's not estimate, it's calculate

Answer 9

Let's set \(\Delta\) to be 0.01 lol

Answer 10

oh it then says to estimate the answer to 4 decimal places?

Answer 11

maybe thats why?

Answer 12

The answer is 1 if you calculate it, no need to estimate to 4 decimal places

Answer 13

i put 1 but it says its wrong

Answer 14

oh it says with x in degrees so i turn 1 to degrees?

Answer 15

57.3 ?

Answer 16

Then let's set \(\Delta x\) to be 0.01 :)

Answer 17

\[\Large f'(x)\approx\frac{f(x+\Delta x)-f(x)}{\Delta x}\]

Answer 18

hmm so f(sin+0.01)-f(sin)/0.01?

Answer 19

sin(0)*

Answer 20

...

Answer 21

f(x) is sin(x) :/

Answer 22

oh! yeah

Answer 23

that still gives me 1

Answer 24

Then let's set \(\Delta x\) to be 0.1 then

Answer 25

still 1 D:

Answer 26

Did the questions before state the value of \(\Delta x\)?

Answer 27

no it just says "Estimate f′(0) if f(x)=sinx, with x in degrees."

Answer 28

Interesting...

Answer 29

here is a picture of it

Answer 30

If \(\Delta x\) is 0.1, you should get 0.9983

Answer 31

it says its wrong too

Answer 32

:(

Answer 33

The question is flawed lol

Answer 34

ahh okay then thank you :) ill let my professor know!