HW HELP
My friend was supposed to help today during lunch but we got distracted by a game of Bullshit, so if anyone here can do this stuff, I'd really appreciate some help.
We're doing Law of Cos and here is a pic of the problem i have to solve:
I know I have to use the Side-Side-Side formula, which is: a^2-b^2-c^2 = -2bc(cosA)
Once everything is plugged in and switched around to isolate A, that formula turns into:
6^2 + 8^2 + 12^2 / 2(8)(12) = cosA
After that, to isolate A from cos, you need to use the inverse (divide both sides by cos) but I don't quite understand the whole inverse thing. I thought the inverse was when it was like cos^-1 but every time I plug that into my calculator, it says error and I don't know what I'm doing wrong.
We're doing Law of Cos and here is a pic of the problem i have to solve:
I know I have to use the Side-Side-Side formula, which is: a^2-b^2-c^2 = -2bc(cosA)
Once everything is plugged in and switched around to isolate A, that formula turns into:
6^2 + 8^2 + 12^2 / 2(8)(12) = cosA
After that, to isolate A from cos, you need to use the inverse (divide both sides by cos) but I don't quite understand the whole inverse thing. I thought the inverse was when it was like cos^-1 but every time I plug that into my calculator, it says error and I don't know what I'm doing wrong.
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Posted: 2010-01-06 16:22:45
Psst.
Responses (24) / Sorted by points
NOOOO ITS ANTIDISESTABLISHMENTARIANISM! >:)
lol thanks. i figured it out...eventually....
It was Pre Calculus. But this is a really old post from the last school year. Sadly, I am now enduring the pain of AP Calculus x_x
Calculus can suck my non-existent balls. It makes absolutely no sense.
thats why i failed that class by doing jack shit and studying for classes that i needed
why don't you use a calculator, rather than trying to do it 1940's way?
I did try to use a calculator but I was plugging something in wrong and I wasn't sure what.
