A placekicker is about to kick a field goal. The ball is 21.6 m from the goalpost. The ball is kicked with an initial velocity of 18.4 m/s at an angle above the ground. Between what two angles, ₁ and ₂, will the ball clear the 2.56-m-high crossbar? Give your answers as (a) the smaller angle and (b) the larger angle. (Hint: The following trigonometric identities may be useful: sec = 1/(cos ) and sec² = 1 + tan².)