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November 11th, 2018, 11:59 AM   #1
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any one can help with this problem:

everything is okay until my book says---->T=5-1
I really thought about it but didn't came up with anything
of course I know a=2 ---> a+sin(0)=3 , a=1
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 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? Thanks from topsquark
 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 y-intercept 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. Thanks from shadow dancer
 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
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Quote:
 Originally Posted by shadow dancer thanks just could you give a hint finding its Derivative

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
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Quote:
 Originally Posted by shadow dancer any one can help with this problem: everything is okay until my book says---->T=5-1 I really thought about it but didn't came up with anything of course I know a=2 ---> a+sin(0)=3 , a=1
Is this just me or is the graph not a sinusoidal function?

-Dan

November 13th, 2018, 08:05 AM   #10
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Quote:
 Originally Posted by Maschke 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.

thanks for summery it's my last year , I've to wait literally till the end of the

possible

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