1. The problem statement, all variables and given/known data You have a device that shoots an object at an angle, on top of a desk. You have x,y and v solve for the angle. Origin is at the top of the desk. 2. Relevant equations y=vyot+(½)ayt2 x = vxot vsinΘ = vyo vcosΘ = vxo 3. The attempt at a solution y= vsinΘt + (1/2)at^2 x = vcosΘt → t = x/(vcosΘ) y = x*(vsinΘ)/(vcosΘ) +(1/2)a(x/(vcosΘ))^2 y = xtanΘ + (a/2)*((x^2)/(v^2cos^2Θ)) from here i moved cos^2Θ to the left and changed tanΘ into sincos but I don't know how to isolate the Θ by itsself. Does anyone have any ideas? I know quadratic equation can be used but i don't know how to change it for Θ Any help is appreciated.