November 11th, 2018, 11:59 AM  #1 
Newbie Joined: Nov 2018 From: Iran Posts: 8 Thanks: 0  Graph
any one can help with this problem: everything is okay until my book says>T=51 I really thought about it but didn't came up with anything of course I know a=2 > a+sin(0)=3 , a=1 
November 11th, 2018, 12:09 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,732 Thanks: 689 
The picture is confusing. What is your question?

November 11th, 2018, 12:13 PM  #3 
Newbie Joined: Nov 2018 From: Iran Posts: 8 Thanks: 0 
I can't find the period the times it is repeated I mean the formula T=2pie  a Last edited by shadow dancer; November 11th, 2018 at 12:22 PM. 
November 11th, 2018, 08:19 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,484 Thanks: 2041 
Try using a graphing calculator (or google) to plot y = 3  2sin((pi/2)x).

November 12th, 2018, 08:20 AM  #5 
Newbie Joined: Nov 2018 From: Iran Posts: 8 Thanks: 0 
It's in our ((konkur)) an examination in which you can't use even the simplest calculators which do simple things like addin' up (you know I want the value of graph at point x=25/3) Last edited by shadow dancer; November 12th, 2018 at 08:28 AM. 
November 12th, 2018, 10:04 AM  #6 
Senior Member Joined: Aug 2012 Posts: 2,265 Thanks: 690 
You're given the yintercept and two critical points. Take the derivative of your function, plug in the critical points and set the derivative equal to zero to find possible values for b. Plug 0 into the original equation to find a. Then just plug in 25/3. 
November 12th, 2018, 12:23 PM  #7 
Newbie Joined: Nov 2018 From: Iran Posts: 8 Thanks: 0 
thanks just could you give a hint finding its Derivative

November 12th, 2018, 12:54 PM  #8 
Senior Member Joined: Aug 2012 Posts: 2,265 Thanks: 690  Hint: Read your textbook. I don't mean to sound glib or unfriendly, but if you are studying calculus you should be able to take that derivative in you head, since the question implies you've seen the required information. If not, that's where you need to review. Sum rule, constant rule, derivative of sin function, chain rule. 
November 12th, 2018, 01:20 PM  #9 
Math Team Joined: May 2013 From: The Astral plane Posts: 2,138 Thanks: 872 Math Focus: Wibbly wobbly timeywimey stuff.  
November 13th, 2018, 08:05 AM  #10  
Newbie Joined: Nov 2018 From: Iran Posts: 8 Thanks: 0  Quote:
thanks for summery it's my last year , I've to wait literally till the end of the year anddd please help my book has solved it in the most ridiculous way possible  

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