tan315-tan60
----------------
1+(tan315)(tan60)
-1-sqrt3
--------
1+sqrt3
multiply top and bottom by 1-sqrt3.....
2+2sqrt3
--------
-2
-1-sqrt3
actual answer: 2+sqrt3
[ 12-01-2003: Message edited by: Monica ]
WHERE AM I GOING WRONG 
-(1+sqrt3) (1+sqrt3)
---------- * ---------
(1-sqrt3) (1+sqrt3)
(-(1+sqrt3)^2)/(1-3)
(-(1+sqrt3)^2)/-2
(1+2sqrt3+3)/2
(2sqrt3+4)/2
2+sqrt3
I like mondays!*die* [ 12-01-2003: Message edited by: Oscar 3/Xray 1 ]
quote:
Monica had this to say about Robocop:
WHERE AM I GOING WRONG
By taking that class 
quote:
Monica had this to say about (_|_):
tan255 = tan(315-60)tan315-tan60
----------------
1+(tan315)(tan60)
-1-sqrt3
--------
1+sqrt3multiply top and bottom by 1-sqrt3.....
2+2sqrt3
--------
-2-1-sqrt3
actual answer: 2+sqrt3
WHERE AM I GOING WRONG
Here:
-1-sqrt3
--------
1+sqrt3
tan 315 - tan 60
----------------
1 + (tan 315)(tan 60)
=>
-1 - sqrt3
----------
1 - sqrt3 (tan 315 = -1; and the tan(a - b) formula has a positive sign in the denomenator)
Thus:
(-1 - sqrt3) * (1 + sqrt3)
---------------------
(1 - sqrt3) * (1 + sqrt3)
=> 2 + sqrt3 [ 12-01-2003: Message edited by: Valso ]
Mine was up first! ::cries::
quote:
Check out the big brain on Valso!
Oscar with the edit cheatedMine was up first! ::cries::
You weren't even close, sorry. After I finished editting, I checked if anyone else posted, and no one had.
i dunno. i set them up according to the formula and it still doesn't work.
ugh.
why can i not do this? [ 12-01-2003: Message edited by: Monica ]
Also, when I have formulas to deal with, I'll do the first few homework problems with the formulas on a page somewhere deep in my notes so that when I want to refer to them it acts as a deterrent. After the first few, I try to stop looking completely (unless the problems are grouped by formula where a later group requires a different formula, in which case I just start over for the new group).
I can't say for sure without, well, being you. I don't know what's common among people and what's unique to how I do math. [ 12-01-2003: Message edited by: Oscar 3/Xray 1 ]
[ 12-01-2003: Message edited by: Monica ]
