#Geometry beginners

141 messages · Page 1 of 1 (latest)

stray iceBOT
fierce fractal
#

so

#

anyone here

#

to help

#

😄

#

cmon

#

bruh i made a form

undone compass
#

Are you asking for an easy way to remember all of this?

fierce fractal
#

yeah

#

kinda

#

my teacher told me some kind of easter egg with the graph itself

#

but icannot remember this

#

its hard

undone compass
#

fwiw, I have a degree in physics, minored in math and still study it extensively. I've been an engineer for years now

#

I still forget most of the trig identities

fierce fractal
#

am i cooked

undone compass
#

The only one I really member is sin(-A)=-sinA and cos(-B)=cosB

#

I mean, you can memorize them. I'm simply saying that it's not the worst thing if you don't

fierce fractal
#

yeah

#

the main problem

#

is

#

what am i suppose to do with the rules

undone compass
#

Basically, you're saying you forget the trick your teacher used and you're asking if any of us know it.

#

That's not a lot to go on

fierce fractal
#

I'm suppose to remember these rules, but I basically don't know for what purpose

undone jasper
#

Is the teacher saying how you can find the tan identitys from sine and cosine ones

fierce fractal
#

yeah kinda

#

he used a trick with the 2 graphs sin and cos that you can see the rules in it

undone compass
#

,w plot y=sin(x)

broken ginkgoBOT
undone compass
#

that graph?

fierce fractal
#

yeah

undone compass
#

Do you know what even and odd functions are?

fierce fractal
#

the only rules that you couldn't see in the grapg were sin A ^2+cos A ^2=1 and tan A = sin A / Cos A

#

nope

fierce fractal
undone compass
#

that will be the trick you probably want

#

It's what give you some of those trig identities you are seeing

trigonometric-even-odd.png
undone jasper
fierce fractal
#

couple

#

but i'm getting error with the A+Pi and A + 0.5 Pi ones

undone compass
#

An even function is symmetric along the y axis. Like, if you put a mirror on the y axis, the function would be a reflection of itself

#

An odd function is symmetric to a half rotation around the origin. Like if you had a graph, and rotated it one half turn, then it would be the same graph

#

you can see that they're using sin as en example of an odd function, and cos as an example of an even function

#

@fierce fractal

heavy topaz
#

Is this not just double angle?

fierce fractal
#

?

heavy topaz
#

Well most of them can be found by translating the graph

fierce fractal
#

yeah

#

wait

#

can u help me

heavy topaz
#

Do u know graph transformations

fierce fractal
#

yeah

#

how iS IT FLIPPED

heavy topaz
#

Oh algebraicly

fierce fractal
#

can you please explain

heavy topaz
#

Go onto desmos and have a play around

fierce fractal
#

HOW

heavy topaz
#

What is flupped

fierce fractal
#

-1/2 or 1/2

#

go to 1/6Pi

heavy topaz
#

Sqrt both sides gives two values

fierce fractal
#

yeah

#

but how does it go to 1/6 pi

heavy topaz
#

Man fuck cast diagrams

#

Just draw the graph

#

Sine graph

#

And cos graph

fierce fractal
#

wait

#

hold up

#

you might be on big shit

#

DAMN

#

why didn't i think of that

heavy topaz
#

Ye the circle is confusing asf

fierce fractal
#

IK

heavy topaz
#

Teachers use it because it's easier to teach???

#

Since calculators give principle values

fierce fractal
#

wait

#

do i read this

fierce fractal
#

1/2 y

heavy topaz
#

Use calcultor

#

In radian modd

#

Mode

fierce fractal
#

so sin (1/2)?

heavy topaz
#

Arcsin. 5

#

Arcsin Is the inverse

#

So when the x value use arcsin

fierce fractal
#

it says

#

0.523598.....

#

how the fuck am i suppose to know that in pi

#

bruh

#

it states it there

#

IN THE CORNER

heavy topaz
#

Calculator should give in pi

fierce fractal
#

yeah i see

#

on god thankyou

heavy topaz
#

Then look at the graph to see what other values of x also give. 5

#

Pi - 1/6 pi also gives .5

#

Aka 5/6 pi

fierce fractal
#

it says

#

both 1/6

#

or -1/6

#

here then

heavy topaz
#

that is for the other value of x

#

-1/6 pi

fierce fractal
#

yeah

#

but if we have

#

like

#

sin(x)= 1/2 root 3

#

it is

#

1/3 pi

#

and the other side

#

2/3 pi

#

cause it has at the same time

#

or somthin

#

they told

#

idk

heavy topaz
fierce fractal
#

what can i do with that

heavy topaz
#

you can move the line up and down

#

desmos is very useful when learning trig

fierce fractal
#

ty

fierce fractal
#

@heavy topaz

#

on chance

#

do you know this rule

#

for differentieting

#

im a close bruh

heavy topaz
#

chain rule

fierce fractal
#

I made other post

#

for that