XAT 2020 Number System — Previous Year Question

$(\pi/2)[(1/\pi)+1] - \pi/2$

$\sin^2 1^{\circ} + \sin^2 2^{\circ} + \dots + \sin^2 89^{\circ}$

$\sqrt{2}\left(3\sqrt{2} - \dfrac{4}{\sqrt{2}}\right) + \sqrt{3}$

$(\sqrt[3]{729})/3 + 22/7$

$(4 - \pi)[1 + (\pi/4) + (\pi/4)^2 + (\pi/4)^3 + \dots]$