- Joined
- Feb 16, 2010
- Messages
- 172
- Reaction score
- 0
Hey guys,
I'm just starting this thread to get some ideas on some of the important equations, constants, facts or anything else that will be useful to write down for the QR section. My plan is to memorize ( hopefully I have most of them memorized already) these and then on my break, I can jot them down on my whiteboard to save time. So far this is the important ones I can think of...
This dandy chart ...
degrees-----Sin----------- Cos---
0 -------- Sqrt(0)/2 ------Sqrt(4)/2
30------- Sqrt(1)/2 ----- Sqrt(3)/2
45------- Sqrt(2)/2------ Sqrt(2)/2
60-------- Sqrt(3)/2 ----- Sqrt(1)/2
90-------- Sqrt(4)/2 ----- Sqrt(0)/2
Sin^2 + Cos^2 = 1
Sin (-A) = -Sin(A)
Cos(-A) = Cos (A)
Sin(2A) = 2Sin(A)Cos(A)
Cos(2A) = Cos^2(A) - Sin^2(A)
Midpoint = ((X2+X1)/2) , ((Y2+Y1)/2)
1 mile = 1760 yards = 5280 feet
C = 5/9 (F-32)
F = 9/5 (C+32)
Please feel free to add🙂!!
I'm just starting this thread to get some ideas on some of the important equations, constants, facts or anything else that will be useful to write down for the QR section. My plan is to memorize ( hopefully I have most of them memorized already) these and then on my break, I can jot them down on my whiteboard to save time. So far this is the important ones I can think of...
This dandy chart ...
degrees-----Sin----------- Cos---
0 -------- Sqrt(0)/2 ------Sqrt(4)/2
30------- Sqrt(1)/2 ----- Sqrt(3)/2
45------- Sqrt(2)/2------ Sqrt(2)/2
60-------- Sqrt(3)/2 ----- Sqrt(1)/2
90-------- Sqrt(4)/2 ----- Sqrt(0)/2
Sin^2 + Cos^2 = 1
Sin (-A) = -Sin(A)
Cos(-A) = Cos (A)
Sin(2A) = 2Sin(A)Cos(A)
Cos(2A) = Cos^2(A) - Sin^2(A)
Midpoint = ((X2+X1)/2) , ((Y2+Y1)/2)
1 mile = 1760 yards = 5280 feet
C = 5/9 (F-32)
F = 9/5 (C+32)
Please feel free to add🙂!!
