Question

Can someone please help me with this Newton's Method's problem??

approximate a solution of sin x =cos 2x in the interval [0, π/2] to three decimal places. Then find the exact solution and compare with your approximation.

Answer 1

Interactive applet (type in your function and the window, and it will do the rest!)
Give it time to load.
Your function, by the way is 0 = sin(x) - cos(2x) (just subtract cos(2x) from both sides of your original equation).

http://www.slu.edu/classes/maymk/GeoGebra/Newton.html

Awesome set of notes:
http://tutorial.math.lamar.edu/Classes/CalcI/NewtonsMethod.aspx

Hope this helps! :)

Answer 2

@Mathteacher, Thanks :)

Answer 3

You're welcome. :) Pauls Online Math Notes are SUPER DUPER reference material, and that little applet is made in Geogebra (a FANTASTIC graphing program!)

Just google "Geogebra " and whatever topic you're studying (like Newton's Method) and you'll get lots of good results.