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Off-Topic Discussion => General Discussion => Topic started by: Knight Templar on December 08, 2004, 11:51:13 pm

Title: Is anyone here good at math?
Post by: Knight Templar on December 08, 2004, 11:51:13 pm

I have a trig test tomorrow and if I don't do well, well, I'll be ****ed to say the least. First person to walk me through each problem gets a cookie.

First problem: Find the exact value of each problem using Double-Angle or Half-Angle identities:  

Cos pi/8

Title: Is anyone here good at math?
Post by: Knight Templar on December 09, 2004, 12:25:16 am

*Bizzump*

Title: Is anyone here good at math?
Post by: Rictor on December 09, 2004, 12:39:21 am

where's CP gone off to anyway?

Title: Is anyone here good at math?
Post by: Knight Templar on December 09, 2004, 12:46:45 am

He's probably off masturbating with a calculator. Damnit.

Title: Is anyone here good at math?
Post by: Joey_21 on December 09, 2004, 01:10:29 am

Half-angle identity:
cos²(½a) = ½(1+cos(a))
cos(½a) = Sqrt(½(1+cos(a)))
since we have cos(pi/8), let a = 2*pi/8 or pi/4

cos(½(pi/4)) = Sqrt(½(1+cos(pi/4)))
= Sqrt(½(1+Sqrt(2)/2))