First off, math is not my strong suit. Just wanted to get that out of the way. Now here's my question. Here's a link with the equations...

High Performance Math ... I'm curious on the 3rd step... up to that point I get...

**intake cam degrees = **__intake valve duration__

2
142 (degrees) =

__284__
2

**theta = 90 - **__intake cam degrees__

2
19 ( Theta) = 90 - 71

Now, here's where I'm stuck....

x = 0.5cos(3.14/(180 / theta))

y = 0.5sin(3.14/(180 / theta))

I'm not certain on the cos/sin part of the equations. Reason I ask is cause when I use my calculator (WINDOWS CALCULATOR), depending on whether I have DEGREES or RADIANS selected, I get 2 different answers for sin/ cosin.

With degrees I get a 0.99996192306417 cos and with radians I get 0.87758256189037.

With degrees I get 0.0087265354983739 sin and with radians I get 0.4794255386042.

Maybe someone can clarify... I'm trying to input the info in EXCEL but the program only calculates it out in radians... Do those equations already consider Radians and give answers in degrees or do I have to covert from radians to degrees. If so, how do I do that. Hope someone can help.

Thanks.

ROB