have : (sqrt π)⁻¹ = (sqrt π)⁻¹ / Real.sqrt 1 := by rw [Real.sqrt_one, div_one]
⊢ Tendsto centralBinomialUpper atTop (𝓝 (Real.sqrt π)⁻¹)
this : (Real.sqrt π)⁻¹ = (Real.sqrt π)⁻¹ / Real.sqrt 1
⊢ Tendsto centralBinomialUpper atTop (𝓝 (Real.sqrt π)⁻¹)