Hello, fardeen_gen!

I agree with your answer . . .

While solving a projectile motion problem, i found the elevation angle as:

, (which is correct according the solution).

The next step requires , which I calculated as equal to:

. .

The text says that: .

We have: .

Hence, is in a right triangle with: .

. . Using Pythagorus, we have: .

Therefore: .

. . This is equivalent to your answer.