Projectile Length - গণিতযজ্ঞ

I don’t get it. I tried all techniques that I know of. Integrated the resultant( in vector format) of derivatives of y(t) and x(t) from 0 to \frac{2v_0sin\theta}{g} Yet, my answer is not accepted. Would you guys suggest any solutions?

There is a problem in this question. When I submit an answer which isn’t whole number, it shows wrong. Whereas, the integer answer is less correct than the actual answer. And, integer answer isn’t required in problem description. @math_rocker ! Please fix it.

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Okay, the margin was too small to enclose both the approximate integer solution and the accurate solution. It’s been fixed now. Thanks for the bug.