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Mathematics 39 Online
Taco:

Graph

Taco:

\[y = \sin x\]

Taco:

Its okay I have my notes and I got that

Hero:

|dw:1526888991554:dw|

Hero:

Anyway, you need to find \(y\) for when \(x\) = \(0, \dfrac{\pi}{2}, \dfrac{3\pi}{4}, \text{ and } 2\pi\)

Hero:

You find the values, I'll plot the points.

Taco:

0, 1, 0, -1, 0 -1 is for 3pi/2

Hero:

|dw:1526889482118:dw|

Hero:

Then you draw a smooth oscillating curve.

Hero:

|dw:1526889569336:dw|

Hero:

And don't forget to label it \(y = \sin(x)\)

Hero:

|dw:1526889618695:dw|

Hero:

Maybe I should include arrows to show the pattern continues in both directions.

Hero:

Anyway, that's about as sloppy as you can draw it and still pass.

Taco:

Okay I think I got this concept. Can you just remind me what to do for the different scenarios like: y = 2sin(x) y = sin(2x) y = sin(x + pi/2) y = sin(x) + 1

Hero:

Basically, what you're facing is a situation where you have to apply the general form of a sinusoidal function: \(y = A\sin(Bx + C) + D\) A = Vertical Stretch/Compress B = Horizontal Stretch/Compress C = Shift left or right D = Vertical Shift left or right.

Taco:

So for A I would multiply by 1 and -1, B I would multiply by the x points (pi/2, pi, 3pi/2, 2pi) C I would add by the x points D I would add by the 1 and -1

Hero:

I don't get what you mean by any of that. Those values don't mean to do any of that. They just transform the function either vertically or horizontally depending on the value.

Hero:

If you plot \(y = 2\sin(x)\) you get a function that is 2 times the value of \(\sin(x)\). The amplitude will be 2 in this case for example

Taco:

I mean if A was 2 and I were to multiply 1 and -1 by 2 it would stretch the graph to 2 and -2.

Taco:

I was just applying the concept to how you would actually transform the graph

Hero:

I guess you can do it that way but I would rather you see it as whatever the value for \(\sin(x)\) you get, multiply that by \(2\). That's the correct way to think of it.

Taco:

I see what you mean. I was just taught it this way.

Hero:

It's not difficult to graph any of them. For example, for \(y = \sin(2x)\) if x is \(\dfrac{\pi} {2}\) then y will be \(0\). So you plot the point \(\left(\dfrac{\pi}{2}, 0\right)\)

Hero:

And if you get C and D values, then just shift the whole function left, right, up or down depending on if the value is + or -

Hero:

Also if the entire function shifts by \(\dfrac{\pi}{2}\) you get the cosine function. I'm sure you remember that from the co-functions lesson.

Taco:

yeah I think I got this down. Thank you

Hero:

No probs @Shadow

Taco:

and for inverses its just flipping...simple enough

Hero:

Exactly

Taco:

someone else called me shadow earlier, who is that?

Taco:

something about daddy

Hero:

It was probably @bm17 your biggest ban I mean fan.

Taco:

oh right the one that wanted to eat me

Hero:

Oh is that why you named yourself Taco. You want her to eat you.

Taco:

i like tacos

Hero:

Or maybe you like to be eaten.

Taco:

no Mexican food is one of my favorites

Hero:

Mexican food is too starch heavy.

Hero:

That's why usually when Mexican people get older, they start getting fat. Really fat

Hero:

It's best to stay away from it..

Taco:

once a month delicacy my friend

Hero:

Smart idea. But what are you going to eat for the rest of the month? Cheerios?

Taco:

can always hunt

Taco:

carrots, wild pigs, lettuce

Taco:

fill my taco with wild pigs and lettuce

Hero:

Wild Pigs? You better stay away from swine. It's not acceptable to eat for most religions in the world. According to legend, it actually the cause of the evil spirits that exist in some people and can cause them to do really strange and evil things in the world. That's why both the Bible and the Koran recommend against consumption. Besides, who wants Swine Flu?

Taco:

so no bacon?

Taco:

that's a cruel world

Hero:

Pretty heavenly actually. People who eat swine, usually when they get older, they start developing all kinds of weird deformities in the face. They're almost unrecognizable. Also some of the people I've run across who are like that their eyes are usually spread out with one looking one way and the other looking the other way. And they sometimes talk to themselves and say deranged things. Very crepy.

Taco:

wow

Hero:

I kid you not. You should go to a big city and conduct a survey and ask random people if they eat swine. Then look at their faces. You'll start to see a trend. Ask people 40 and up and you'll see.

Taco:

this is something I have never thought about before

Taco:

are you vegetarian

Hero:

Yep, and all I eat is stuff like lentils, avocados, bananas, spinach, and juice both fruits and veggies. I only eat clean foods. But of course, that's the kind of town this is. Only Organic vegetarian. Conventional food is basically banned.

Taco:

no taco bell?

Hero:

Actually, we have Taco Johns. I never go there. The people who do go there, they're all fat.

Hero:

And pizza joints and other fast food restaurants are even worse. And then there was a time when I thought restaurants like Subway was healthy. But almost every person who has worked there for 5 or more years, all of them were fat. Every single one of them. Of course they ate the food there. And I'm talking obese level.

Taco:

jeez

Hero:

Scary stuff. Yep, just observe and you'll see. Go to a Subway and like find a manager there or something. If you see one that's really obese ask how long they've been working there. I bet they say at least 5 years.

Taco:

have you always been vegetarian?

Hero:

Not always, but I've been vegetarian since 2004.

Taco:

was observing all that the catalyst?

Hero:

Nope. It was people in the family dying of cancer. All men over the age of 50. I was only a kid at the time this started happening so I had to do my research. Then I started finding all kind of shocking truths about the medical and food industries. Changed my diet shortly afterwards. Started consuming superfoods like Chlorella, Spirulina, and Moringa is my new favorite. That's nature's multi-vitamin.

Hero:

Been consuming Moringa regularly for the past 3 years.

Taco:

wow I don't think I can give up meat though

Hero:

The observation took place after I made the diet change. I started wondering to myself, "What happens to the people who continue to consume the SAD (Standard American Diet). And well, I have some internal documentation on that.

Taco:

thoughts on fish?

Hero:

I mean, you can still consume meats as long as it's "clean" wild meats like Deer, Elk, Moose, Chicken, Buffalo, etc.

Hero:

Those won't make you fat if consumed in moderation. Balanced diet is the key along with periodic fasting and consuming water and tea and regular exercise.

Hero:

Avoid restaurants as much as possible. I used to go to restaurants when I wanted fries for example. Now I just make my own fries.

Hero:

Much easier to to cook at home when you have your own place

Taco:

true. potatoes are one of my favorite things to cook

Hero:

Here you go: SHELLFISH_UncleanAnimals.png

Taco:

dont have to tell me to not eat snakes

Taco:

what about turkey?

Taco:

Hallelujah it's clean

Hero:

Congrats bro. I was cautious about calling it clean because I know that Americans eat Turkey for thanksgiving and we don't celebrate that.

Taco:

who is 'we'

Hero:

Israelites

Taco:

oh

Taco:

I have a legit math question again

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