Question: How can I solve this problem is from calculus What two angles of elevation will enable a projectile to reach a target 14 km downrange

How can I solve this problem is from calculus

What two angles of elevation will enable a projectile to reach a target 14 km downrange on the same level as the gun if the projectile's initial speed is 389 m/sec? The two angles of elevation are and (Round to the nearest degree. Use ascending order.)

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