Need Math help please

[Fishlore]

EXTREME EDIT:

I need help solving this small problem.

cos(AOB) = -0.109417873
So AOB = 96.28175959 degrees

I don't understand how to solve for AOB. If anyone could lend a hand I appreciate it.

 

[Fishlore]

EXTREME EDIT cont'd.

 

[Nat Turner]

Do you mean the shortest distance between the two pairs, or the distance across the surface of the Earth??

 

[Fishlore]

EXTREME EDIT cont'd.

 

[Fishlore]

LOL, I just found a link with the solution to anyone that care.

http://mathforum.org/library/drmath/view/51722.html

They guy I got this info from apparently got his info from here.

My question is how does this work?
cos(AOB) = -0.109417873
So AOB = 96.28175959 degrees
= 1.680433715 radians

 

[madog]

Simple task my brother, only requires a scientific calculator.

cos(AOB) = -0.109417873

Multiply each side by cos^-1 so it would be: cos^-1(-0.109417873)

The value comes out to be the one you previously stated for AOB.


Oh, and to convert degrees to radians, here is what you do:

96.28175959 degrees x (Pi radian/180 degrees) = 1.680433715 Pi radians.

May your journey for knowledge take you far and improve your being!

EDIT: Hold on! That answer seems to be invalid. 96.28175959 degrees does not equal 1.680433715 Pi radians. I got approximately .535 Pi. But that is how you convert anyway.

 

[Stigmata]

No, that should be right. A half-circle is equal to pi radians (3.14rad), so any angle over 90 degrees must be greater than pi/2 (roughly 1.58). So the answer of 1.6rad looks good, since the angle given is only slightly over 90 degrees.

 

[JellyWorld]

Multiply each side by cos^-1 so it would be: cos^-1(-0.109417873)

You can't multiply something by a function. But yeah, just use cos^-1(-0.109417873) to get the answer, simple as that.

 

[Fishlore]

Thanks everyone I got it working. Those answers are correct. Java functions expect degree values for their trig functions. My data was radian based and that led to all sorts of problems before I realized I need to to convert it first. I also didn't know what function correlated to cos^-1. It ended up being the arccosine function. I forgot about that one. So thanks again to everyone who took their time to check this out.

 

[Dog--]

I hate math!!

 

[madog]

You can't multiply something by a function. But yeah, just use cos^-1(-0.109417873) to get the answer, simple as that.

Yes you can. cos^-1 is used to cancel out cos. I did homework on this recently and it even says it in the textbook.
Oh and stigmata is correct, but still when you change that degree to Pi radian it seems to not come out correctly. I may have skipped a step or something though.

 

[Hazar]

I love my ti-89

 

[Nat Turner]

I love my ti-89

i just got a ti-89

it is wonderful

 

[bam23]

Uninstall.

 

[Hazar]

i just got a ti-89

it is wonderful

once you learn how to use it you relize how much it can do...
solve derivatives, integrals, etc etc... so usefull

 

[Ikerous]

can the 89 do symbolic integration? I wish my 84 could D:

 

[Hazar]

such as indefinent integrals?

don't know exactly what you mean


btw, the only thing that really sucks about it is that you can't use it on the ACT D:

 

[Ikerous]

Yea

 

[Nat Turner]

can the 89 do symbolic integration? I wish my 84 could D:

yes it can!

 

[Ikerous]

yes it can!

Lucky bastards! D:
It'd be really nice to have :|

 

[Hazar]

indeed!

 

[Pesmerga]

you see its all rly quite simple