1.tan−113+tan−115+tan−117+tan−118\tan^{-1} \frac{1}{3} + \tan^{-1} \frac{1}{5} + \tan^{-1} \frac{1}{7} + \tan^{-1} \frac{1}{8}tan−131+tan−151+tan−171+tan−181 has the valuea.π4\frac{\pi}{4}4πb.π6\frac{\pi}{6}6πc.π2\frac{\pi}{2}2πd.π3\frac{\pi}{3}3πLogin to continueOnly logged in users canattempt or see the solution.
