Tweet
Hrm...
1
42
39
---
1
378
1260
------
1638
1
42
39
---
1
378
1260
------
1638
-
meet the new boss, same as the old boss -
Why in god's name are you doing trig on Xmas eve?(+1)Comment
-
42 x 39 = (40 + 1) (40 - 1) +39 = 40^2 - 1 +39.Originally posted by mrmitchell
Hrm...
1
42
39
---
1
378
1260
------
1638
Comment
-
My uni (yes this is uni work, albeit only a first year refresher thingy) decided it would be a nice idea to give me 5 pieces of coursework to do over christmas. And besides christmas eve is hardly a sacred day to me... it's as good a day as any to do trig.Why in god's name are you doing trig on Xmas eve?Comment
-
Actually, mathematicians are notoriously bad at arithmatic.Advanced Maths is being able to do 42 x 39 in a couple of seconds, not remembering daft little formulae.
Both 42*39 and the trig formulas can be derived through a few short tricks. Juggernaut showed how to do 42*39, and cos(2x) can be expanded quite easily if you Taylor expand the exponential fuction of ix.
Mathematicians don't try to multiply large numbers or integrate trivial functions, but investigate the nature of things like the multiplication of reals and the integration of scalar functions, and see if they can determine any interesting things from them."Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before. He is full of murderous resentment of people who are ignorant without having come by their ignorance the hard way. "
-BokononComment
-
once again... problem solving.Originally posted by Juggernaut
42 x 39 = (40 + 1) (40 - 1) +39 = 40^2 - 1 +39.
:-pComment
-
First thing you need to realise that I could be in a different time zone than yours. Basic knowledge, yes?Originally posted by Boddington's
15:27.
Go and read.
Second thing is, you are sad if you count punching calculator or doing mental arithematic as mathematic skills.(\__/) 07/07/1937 - Never forget
(='.'=) "Claims demand evidence; extraordinary claims demand extraordinary evidence." -- Carl Sagan
(")_(") "Starting the fire from within."Comment
-
Says the guy posting about Maths on Christmas Day.www.my-piano.blogspotComment
-
But we forgive you for it, Bodds.I'm building a wagon! On some other part of the internets, obviously (but not that other site).Comment
-
Do you have a problem with that?Originally posted by Boddington's
Says the guy posting about Maths on Christmas Day.(\__/) 07/07/1937 - Never forget
(='.'=) "Claims demand evidence; extraordinary claims demand extraordinary evidence." -- Carl Sagan
(")_(") "Starting the fire from within."Comment
Comment