Assuming:
The equations for the vertical and horizontal components of my initial velocity. Are:
$v_{x,i} = v_i \cos\theta$ and $v_{y,i} = v_i \sin\theta$
And the displacement components are represented as:
$x = x_i + v_{x,i}t + \frac12 a_xt^2$ and $y = y_i + v_{y,i}t + \frac12 a_yt^2$
Ive played around with all these formulas and what not. But Id like to know if there are other formulas that would allow me to find the values of theta that would allow the projectile to reach a certain target if the initial velocity is know. Or perhaps the velocity needed to reach a point, given a set distance and angle (theta).. There is a formula I found that is a variation of the quadratic formula. But it doesnt seem to give good info when the projectile is launched from a higher or lower elevation.
$v_x=v\cos(\theta)$
renders as $v_x=v\cos(\theta)$. It would also help if you made it clearer exactly what your question is. $\endgroup$