1.Let Sn=cot−12+cot−18+cot−118+cot−132+…S_n=\cot^{-1}2+\cot^{-1}8+\cot^{-1}18+\cot^{-1}32+\ldotsSn=cot−12+cot−18+cot−118+cot−132+… to nthn^{\text{th}}nth term. Then limn→∞Sn\displaystyle\lim_{n\to\infty}S_nn→∞limSn isa.π3\frac{\pi}{3}3πb.π4\frac{\pi}{4}4πc.π6\frac{\pi}{6}6πd.π8\frac{\pi}{8}8πLogin to continueOnly logged in users canattempt or see the solution.
