Mathematical Methods - Pre-Exam 2 Advice for 2012

[sin0001]

Thanks

[Jenny_2108]

^ After reading posts on this thread, I just realise so many yr 11 students do methods unit 3/4 :OOO
You are all amazing

[Kanon]

You have to assign them yourself, I found this quick tutorial on Youtube for the Classpad
http://www.youtube.com/watch?v=wCDgYfLl6Rw


Thank you D.H!  Did you know of any other cool things like that?
I feel asif I owe you my life haha! I from year 10 onwards I regret purchasing the Classpad for its limited number of buttons
Do you know of the TanLine( function?  It'll automatically calculate a tangent to at the desired point.

[D.H]

You have to assign them yourself, I found this quick tutorial on Youtube for the Classpad
http://www.youtube.com/watch?v=wCDgYfLl6Rw


Thank you D.H!  Did you know of any other cool things like that?
I feel asif I owe you my life haha! I from year 10 onwards I regret purchasing the Classpad for its limited number of buttons
Do you know of the TanLine( function?  It'll automatically calculate a tangent to at the desired point.

Yes I went to the Derrick Ha lecture and probably the most useful piece of information that I learnt was the TanLine( and normal( function which actually saves a LOT of time. I really never touched the cat section because I thought it all looked like garbage I'd never use. I always get a little excited when I get the opportunity to use TanLine( or normal(.
/nerd

[Kanon]

You have to assign them yourself, I found this quick tutorial on Youtube for the Classpad
http://www.youtube.com/watch?v=wCDgYfLl6Rw


Thank you D.H!  Did you know of any other cool things like that?
I feel asif I owe you my life haha! I from year 10 onwards I regret purchasing the Classpad for its limited number of buttons
Do you know of the TanLine( function?  It'll automatically calculate a tangent to at the desired point.

Yes I went to the Derrick Ha lecture and probably the most useful piece of information that I learnt was the TanLine( and normal( function which actually saves a LOT of time. I really never touched the cat section because I thought it all looked like garbage I'd never use. I always get a little excited when I get the opportunity to use TanLine( or normal(.
/nerd

Ahah, I also found out about the TanLine and Normal function from the Derrick Ha lecture!

[Hutchoo]

Can someone teach me how to use the Tanline( and Normal( function.
I understand where it is on the CAS, but I don't know what syntax is needed to execute the equation in the CAS.

[charmanderp]

You have to assign them yourself, I found this quick tutorial on Youtube for the Classpad
http://www.youtube.com/watch?v=wCDgYfLl6Rw


Thank you D.H!  Did you know of any other cool things like that?
I feel asif I owe you my life haha! I from year 10 onwards I regret purchasing the Classpad for its limited number of buttons
Do you know of the TanLine( function?  It'll automatically calculate a tangent to at the desired point.

Yes I went to the Derrick Ha lecture and probably the most useful piece of information that I learnt was the TanLine( and normal( function which actually saves a LOT of time. I really never touched the cat section because I thought it all looked like garbage I'd never use. I always get a little excited when I get the opportunity to use TanLine( or normal(.
/nerd

Ahah, I also found out about the TanLine and Normal function from the Derrick Ha lecture!

Don't even bother with cat, you can just access both of these by going to Main --> Interactive --> Calculation and then looking to the second section. Input the expression, a point and voila!

[D.H]

Can someone teach me how to use the Tanline( and Normal( function.
I understand where it is on the CAS, but I don't know what syntax is needed to execute the equation in the CAS.

Example, if you want to find the equation of the tangent of the function y=x^2 at x=1, here is what you enter:
TanLine(x^2, x, 1)

[Kanon]

Can someone teach me how to use the Tanline( and Normal( function.
I understand where it is on the CAS, but I don't know what syntax is needed to execute the equation in the CAS.

Sure!
I assume you're using the Classpad haha

So lets say you want to find the tangent and the normal of the equation y = x^2 at x = 3

Tangent Line
Main
- Interactive
- - Calculation
- - - tanLine
a window should pop up,
Expression: x^2 (just the rule of the expression)
Variable: x (just the variable you're using, most likely x or t)
Point: 3 (the x-value of the point you want the Tangent at)

Alternatively, if you're using the catalogue
tanLine(x^2,x,3)
so tanLine(Expression, Variable, Point)

Normal
Exactly the same thing, however, in the interactive menu pick 'normal'
same format in the cat aswell

[Hutchoo]

This is amazing! I always found the tanline for MCQ by going into graph and tab -> tanline. SIGH, how could I not notice that XD.

[TheFedExpress]

TanLine is awesome for MC questions, but if we are asked it in the Extended Response section, worth say 2 marks, I'm assuming we would have to solve by hand?

[Shenz0r]

Solve it by hand, but at least you'll have your CAS to check your answer.

[paulsterio]

TanLine is awesome for MC questions, but if we are asked it in the Extended Response section, worth say 2 marks, I'm assuming we would have to solve by hand?

Hahah, you be cheeky, this is what I'd do

1) Find dy/dx (using calculator)
2) Find gradient at point (substitute using calculator)
3) Write, y - y1 = m(x - x1)
4) Write that again, with the correct values in place
5) Use TanLine to get the right answer, write down the right answer

[charmanderp]

TanLine is awesome for MC questions, but if we are asked it in the Extended Response section, worth say 2 marks, I'm assuming we would have to solve by hand?

Hahah, you be cheeky, this is what I'd do

1) Find dy/dx (using calculator)
2) Find gradient at point (substitute using calculator)
3) Write, y - y1 = m(x - x1)
4) Write that again, with the correct values in place
5) Use TanLine to get the right answer, write down the right answer

Is writing y - f(x1) = m(x - x1) appropriate?

[Jenny_2108]

Is writing y - f(x1) = m(x - x1) appropriate?

I don't think so. Your notation should be consistent