My Math Forum Graphing sin

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 April 8th, 2009, 05:35 PM #1 Newbie   Joined: Jul 2008 Posts: 27 Thanks: 0 Graphing sin Is this done right? The main question is line 5, i must have done someting wrong in line above but dont knwo what. Any help is appreciated. Thanks y=2-2sec(x-pi/5) 0<= x-pi/5 <= 2pi 2pi/1+pi/5 = 11pi/5? pi/5 <= x <= 11pi/5 Make table: pi/5+11pi/5 = (12pi/5)2 = 6pi/5? pi/5+6pi/5 = (7pi/5)/2 = 7pi/10? 6pi/5+11pi/5 = (17pi/5)2 = 17pi/10? Line 1 table 7pi/10 - pi/5=pi/2? 6pi/5 - pi/5 = pi? 17pi/10 - pi/5 = 3pi/2? 11pi/5 - pi/5 = 2pi? Line 2 table sec(pi/2) = pi/2? sec(pi) = 0? sec(3pi/2) = -2pi? sec(2pi) = 0 Line 3 table -2(pi/2) = -pi? -2(0) = 0 -2(-2pi) = 4pi? Line 4 table 2-0 = -2? 2 - pi = ? 2 - 0 = -2? 2 - 4pi = ? 2 - 0 = -2 Line 5 table x | pi/5 | 7pi/10 | 6pi/5 | 17pi/10 | 11pi/5 | x-pi/5 | 0 | pi/2 | pi | 3pi/2 | 2pi | sec(x-pi/5) | 0 | pi/2 | 0 | -2pi | 0 | -2sec(x-pi/5) | 0 | -pi | 0 | 4pi | 0 | 2-2sec(x-pi/5) | -2 | ? | -2 | ? | -2 |
 April 8th, 2009, 06:10 PM #2 Global Moderator   Joined: Dec 2006 Posts: 18,962 Thanks: 1606 As you haven't stated what you're trying to accomplish, it's impossible to assess what you've done (other than to observe that some parts don't seem to make any sense).
 April 8th, 2009, 06:17 PM #3 Newbie   Joined: Jul 2008 Posts: 27 Thanks: 0 Re: Graphing sin im trying to find my points with the table at the bottom to graph that equation. I need to graph y=2-2sec(x-pi/5). it looks a little hectic, but didnt know how else to show my work. The formatting didnt come out how i wanted it to. the last 5 lines are the tablei was taught to do. the lines above that are how i come up with points that are i the table. The top row is the x poitn, the last row is the y points. I dont know how else to show it whree you can read it better. on top row of table the x row, is max and min or wave, the rigth most and left most respectively. take the averge of those to find the center point of table, then take average of first and third to second, then average of third and last to find fourth. then move to second row, x-pi/5, take the first number of first row, the x number, and subtract pi/5. do that down the row to fill in blanks, repeat steps till get to last row which is the y points. Then graph using x and y points.
 April 9th, 2009, 03:42 AM #4 Global Moderator   Joined: Dec 2006 Posts: 18,962 Thanks: 1606 Surely you can check any individual values of the function (except that sec(pi/2) is undefined) using a calculator. You could also see the graph using a graphic calculator.

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