ATAR Notes: Forum

VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: hifer on November 08, 2007, 07:50:18 pm

Title: Sketching graphs
Post by: hifer on November 08, 2007, 07:50:18 pm

when sketching graphs, is it essential tat u put arrows on ends of the curve? Irena from TSFX seemed to emphasize that alot..

And when the ques say sketch without specifying what u need to show, would it be necessary to show the endpts and intercepts?

Title: Sketching graphs
Post by: Freitag on November 08, 2007, 07:55:56 pm

I'd definitely label intercepts and endpoints.

If the graph has no end points, what's to lose by using arrows to indicate that the graph continues beyond your sketch?

Title: Sketching graphs
Post by: maxleng on November 08, 2007, 08:02:33 pm

question about trig graphs, i dont know how to get the y int w/o calc?

eg. y=2sin(2(x-pi/3))

y= 2sin(-2pi/3)

where do i go from here?

Title: Sketching graphs
Post by: Freitag on November 08, 2007, 08:06:32 pm

Quote from: "maxleng"

question about trig graphs, i dont know how to get the y int w/o calc?

eg. y=2sin(2(x-pi/3))

y= 2sin(-2pi/3)

where do i go from here?

Sin (-2pi/3) --> Third Quadrant. Sin will be negative (All Schools Teach Crap)

Hence Sin ( -2pi / 3 ) = - Sin ( pi / 3 ) = - root(3) / 2

Therefore 2sin(-2pi/3) = -root(3)

Title: Sketching graphs
Post by: maxleng on November 08, 2007, 08:09:30 pm

i knew i should have gone over trig properties...

and its likely that there will be a trig sketching Q, fuk!!

Title: Sketching graphs
Post by: Freitag on November 08, 2007, 08:10:44 pm

Just remember your exact values. Drum them into your head tomorrow morning at breakfast or something ^^

Title: Sketching graphs
Post by: bubble sunglasses on November 08, 2007, 08:24:20 pm

Quote from: "Freitag"

Just remember your exact values. Drum them into your head tomorrow morning at breakfast or something ^^

 
  Freitag, I think you made a mistake with one of the scores in your sig.

    Meg got 41 for Revs, therefore surely you must have got 40???

Title: Sketching graphs
Post by: Freitag on November 08, 2007, 08:25:36 pm

Nope, got a 38. I got a statement of marks, failed on the final Russia section (13/20, wtf?) , got an A for the exam.

Title: Sketching graphs
Post by: bubble sunglasses on November 08, 2007, 08:36:07 pm

Quote from: "Freitag"

Nope, got a 38. I got a statement of marks, failed on the final Russia section (13/20, wtf?) , got an A for the exam.

   I was joking, remeber you'd agreed with Meg that whatever she'd get, you'd get one mark lower. I remember you said to her "Can you get 50 so I can get 49?"  

   Nah, your work on vcehistory.info improved *heaps* over time -some of your later responses to Steve's trial qs owned everydody else's  :)