# Thread: HELP ME WITH MAH MATH

1. ## HELP ME WITH MAH MATH

I have a test tomorrow and my match teacher is a fucking horrible 'teacher.'

I got dis:

cos 3x = 1/2

so I do

x = inverse of cos(1/2)/3

Using my special triangles I know that the inverse cos of one half is 60 degrees. SO SINCE ITS FUCKING POSITIVE THE REFERENCE ANGLE ONLY EXISTS IN THE FIRST AND FOURTH QUADRANT BUT THE BOOK SAYS OTHERWISE : @

30/3 = 10 degrees.

thats pi/9, and in the fourth quadrant thats 17pi/9

Its restricted between 0 and 2 pi
My textbook gets: pi/9, 5pi/9, 7pi/9,11pi/9,13pi/9,19pi/9

WHERE DO ALL THOSE OTHER ANSWERS COME FROM?

3. Notes, notes, notes.

4. I DONT GET ANY NOTES - THATS HOW MY TEACHER ROWLES

The page before explains how to do it w\ a graphing calculator :/

5. Take Secret Notes. DUUUUH.

6. I'm so fucked for this test

7. Originally Posted by Jetamay
I DONT GET ANY NOTES - THATS HOW MY TEACHER ROWLES

The page before explains how to do it w\ a graphing calculator :/
You don't have a graphing calculator?

FAAAAAAAAAAAAIL.

8. Originally Posted by Empire

You don't have a graphing calculator?

FAAAAAAAAAAAAIL.
We're not allowed to use them on tests

If we could math would be sooo easy.

Plus they're like a hundred bucks.

9. Man. i have to start learning maths soon.

10. Originally Posted by Jetamay
We're not allowed to use them on tests

If we could math would be sooo easy.

Plus they're like a hundred bucks.
Yeah, a hundred bucks and i can do all my math in less than half the time for years.

Gee, sounds like a good investment. I still have mine from 5 years ago, works great.
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Math teachers that don't allow graphing calculators on test are only holding you back. As you will definitely use a calculator later on. They are just doing the "well we didn't when we were young" thing old bitches do.