Question

Use the law of cosines to find the value of 2*3*4 cos. WILL GIVE MEDALS!!!! (Link to pic below)

Answer 1

http://media.apexlearning.com/Images/200712/18/932405ad-ade5-4264-b324-304c552e58e6.bmp

Answer 2

The different answers are -24
21
-21
24

Answer 3

would this help? http://www.mathwarehouse.com/trigonometry/law-of-cosines-formula-examples.php

Answer 4

Go here:
http://www.1728.org/trigtut2.htm
and you'll find this formula:

Answer 5

I figured you'd need another graphic too.

cos (A) = (b^2 + c^2 -a^2) / 2 * b *c
cos (A) = (4^2 + 3^2 -2^2) / 2 * 4 * 3
cos (A) = (16 + 9 -4) / 24
cos (A) = 21 / 24
cos (A) = .875
arc Cos (.875) = 28.955 Degrees

Answer 6

Your question asks "find the value of 2*3*4 cos".
I'm guessing cos means cos theta = cos(28.955) which equals .875
So, 2*3*4 * .875 = 21

Answer 7

terminator9999
Did you ever figure out an answer to this?