okay.

For part 2b, I tried using the newton's method but I'm not sure if I'm doin it right or suppose to be using this method to get the accurate answer. any idea on wat I should do



This post was edited by TheDiablo3KnowItAll on Sep 13 2014 11:23am

the real answer comes from 1-cos(x)
ask matlab to just solve for (1-cosx)
don't use another method to approximate it again

error
[(1-cosx) - xx/2]/(1-cosx)

This post was edited by saber_x3 on Sep 13 2014 12:15pm

isn't the error= [(xx/2) - (1-cosx)] / (1-cosx)? numerical answer - true answer / true answer

doesn't really matter, real value is on the bottom is what matters

ok btw we are talkin about 2b, so this is what I did. It gave me 2 roots one being 10^8 and the other one is 0 which is close to exact root of 10^-8.

how do I make it output the true values of the root/find the two solutions accurately

It is using an approximation to solve it
You can try to format your answer to show more digits. I don't know how to format output

I know matlab has solvers in it that you can use for many different things
try the polynomial or quadratic solver, they might be more accurate or exact

errors come from how the program store values, different types/order of multiplying, and the preset desired accruacy

ehh I changed it up and I got this

http://imgur.com/xpz694K

u think this is acceptable?