Is anyone good at precalculus?

[Guest]

I am trying to study for a test and I am having a bit of trouble understanding this. 

 

Could someone provide an explanation of this problem? 

[jezza39]

The answers are y = x³, y = x, y = 1/x, y = sin(x).

 

An odd function is a function where -f(x) = f(-x). That is, a function that when reflected in the y axis is identical to when it is reflected in the x axis. Think of y = x, when you reflect it in the x axis it becomes y = -x, when you reflect it in the y axis it becomes y = -x again, thus the function is 'odd'.

 

Edit: If y = int(x) means round down to next integer. Then it is a piecewise stepped function of y = x and I think is odd too.

[Guest]

The answers are y = x³, y = x, y = 1/x, y = sin(x).

An odd function is a function where -f(x) = f(-x). That is, a function that when reflected in the y axis is identical to when it is reflected in the x axis. Think of y = x, when you reflect it in the x axis it becomes y = -x, when you reflect it in the y axis it becomes y = -x again, thus the function is 'odd'.

BTW what does y = int(x) mean? Integral of x? If so that is y = 0.5*x² which is not odd.

thank you!

[lekro]

BTW what does y = int(x) mean? Integral of x? If so that is y = 0.5*x² which is not odd.

int(x) means to truncate all the decimal from x.

e.g.

2.5872 -> 2

4.9999 -> 4

5398.298521 -> 5398

[jezza39]

thank you!

 

No worries mate

 

int(x) means to truncate all the decimal from x.

e.g.

2.5872 -> 2

4.9999 -> 4

5398.298521 -> 5398

 

Ahhhh so it's how you write y = x%1 (computer talk)

[lekro]

No worries mate

 

 

Ahhhh so it's how you write y = x%1 (computer talk)

well, kinda... assuming %  is the modulo operator it would be more like

 

y = x - x % 1

 

because x % 1 = the decimals of the number

[Deletive]

Omg I have to learn this next year  :wacko:

[PC-NOOB]

Omg I have to learn this next year  :wacko:

 

If you paid attention in Alg2/Trig you should be fine.

Most of it is just applying information you already know.

[jezza39]

If you paid attention in Alg2/Trig you should be fine.

Most of it is just applying information you already know.

 

Calculus is much easier to get your head around than circular functions. You get a bunch of rules, then you have to look at a function and decide which ones to apply where and bob's your uncle I'm sure everyone here will smash it

[jezza39]

well, kinda... assuming %  is the modulo operator it would be more like

 

y = x - x % 1

 

because x % 1 = the decimals of the number

 

Yeah sorry, mind blank

[lekro]

Yeah sorry, mind blank

Trying to mix Math and Compsci for me doesn't work either xP

[juretrn]

Damn, how many math subjects do you people have? Here, it's all just a single math subject.

[jezza39]

Damn, how many math subjects do you people have? Here, it's all just a single math subject.

 

I'm now studying electrical engineering so I have lots

[cubercaleb]

Pretty useless IMO, wasn't even on the AP Calc AB exam

[juretrn]

I'm now studying electrical engineering so I have lots

I also study electrical engineering, and we still have only one at once...

[PillowSmoke]

sin and cos. Is this slightly trig?

[jezza39]

I also study electrical engineering, and we still have only one at once...

I'm counting electromagnetism and signals as maths cos they're so heavily maths based for me

[juretrn]

I'm counting electromagnetism and signals as maths cos they're so heavily maths based for me

That's true.Are you still doing your bachelor's degree or are you already in master's program?

[jezza39]

That's true.Are you still doing your bachelor's degree or are you already in master's program?

Bachelors, with honours that is compulsory. You? Here all you need for medicine/law/engineering is an undergrad to be qualified, no need to do a masters if you pick the right course

[juretrn]

Bachelors, with honours that is compulsory. You? Here all you need for medicine/law/engineering is an undergrad to be qualified, no need to do a masters if you pick the right course

One more exam to finish bachelor's program, then I go to master's in October.