Math & Jass Problem

[Trollvottel]

I made a system for throwing something and so I tried to make a formula for required speed with given angle and distance.
I know the formula for distance is

distance = (Speed*Speed) * Sin(2*angle) / g

so I changed it into

Speed = SquareRoot(distance * g / Sin(2*angle))

but it doesnt work.
the other formulas I use are for x:

x = speed * time * Cos(alpha)

and for y:

Tan(alpha * bj_DEGTORAD) * x - (g/2*Speed* Pow(Cos(alpha,2))) * x²

 

[Trollvottel]

desperated bump

the weird thing is, i can change everything so that it works. but when i then change the angle it doesnt work anymore....

 

[Cohadar]

http://id.mind.net/~zona/mstm/physi...leMotion/generalSolution/generalSolution.html
http://en.wikibooks.org/wiki/High_school_physics/Projectile_motion

 

[Trollvottel]

thank you, that is what im searching for, i guess i searched for the wrong keywords in the wrong language
/edit: ah i see where my error was....

Tan(alpha * bj_DEGTORAD)
should be
Tan(alpha)

and this was everything -.-