IPMAT Indore 2021Geometry > Medium−12\frac{-1}{2}2−112\frac{1}{2}21−12\frac{-1}{\sqrt{2}}2−132\frac{3}{\sqrt{2}}23✅ Correct Option: 1Related questions:Given that cosx+cosy=1\cos x + \cos y = 1cosx+cosy=1, the range of sinx−siny\sin x - \sin ysinx−siny isThe angle of elevation of the top of a pole from a point A on the ground is 30°. The angle of elevation changes to 45°, after moving 20 meters towards the base of the pole. Then the height of the pole, in meters, isThe value of cos2(π8)+cos2(3π8)+cos2(5π8)+cos2(7π8)\cos^2\left(\frac{\pi}{8}\right) + \cos^2\left(\frac{3\pi}{8}\right) + \cos^2\left(\frac{5\pi}{8}\right) + \cos^2\left(\frac{7\pi}{8}\right)cos2(8π)+cos2(83π)+cos2(85π)+cos2(87π) is