Why are TI-89s so confusing to use?

[FAMY2]

find the inverse sine of 1.234 degrees

I AM NOT A MAN. Therefore I don't do math. On demand at least. caterpie;

[The artist formally known]

I AM NOT A MAN. Therefore I don't do math. On demand at least. caterpie;

doing that in your head is near impossible for an average human. also pretty hard to do on paper too.

[FAMY2]

doing that in your head is near impossible for an average human. also pretty hard to do on paper too.

  I though men could do anything. I am disappointed.

[Nyerp]

i'm going into 12th and i don't even know what the hell 'sine' is

southern education sucks

...

don't blame southern education, idiot

[guff]

doing that in your head is near impossible for an average human. also pretty hard to do on paper too.

uh not very difficult at all if you know the taylor series for arcsine

though, it doesn't make much sense to use inverse trig functions on an angle

[Squirtlejazz]

Its confusing because its not a Ti-84.

[ncba93ivyase]

...

don't blame southern education, idiot

I'm in "advanced" math classes, just one level below the absolute highest I could possible get into (and only like 25 people get into that per year and there's like 500 people per grade), and not a single teacher has ever talked about it.

[Nyerp]

I'm in "advanced" math classes, just one level below the absolute highest I could possible get into (and only like 25 people get into that per year and there's like 500 people per grade), and not a single teacher has ever talked about it.

ok, it's your school system

not the south

[ncba93ivyase]

ok, it's your school system

not the south

it's a southern school system

[[REDACTED]]

because you're retarded

the syntax is pretty intuitive

oh yeah
i just realized how to do it, it's similar to the syntax on the ti-84
anyway, thanks guff for help with self-realization

[Kalahari Inkantation]

i'm going into 12th and i don't even know what the hell 'sine' is

sine, cosine, tangent
soh cah toa
you weren't taught trigonometry

[Hiro]

sine, cosine, tangent
soh cah toa
you weren't taught trigonometry

I learned that in 8th grade

[Kalahari Inkantation]

I learned that in 8th grade

I learned in 9th. :'(

[Hiro]

I learned in 9th. :'(

Yeah my teacher just taught us for fun, he didn't need to.  He also made us do sudoku before anyone had heard of it.
I <3 Mr Barret, I lived across the street from him when I was little. 
I also love my 8th grade homeroom/social studies teacher, Mr Jacobs.

[spoiler=Mr Jacobs][/spoiler]

[CutLess]

my teacher taught us combinatorics instead of trigonometry at the end of 8th grade

i didn't pay attention, though