To determine the value of tan(7π/8) ,which identity could be

Last updated: 8/10/2022

To determine the value of tan(7π/8) ,which identity could be used? I.(1 - cos(7π/4))/sin(7π/4) II.sin(7π/4)/(1 - cos(7π/4)) III.-{(1 - cos(7π/4))/(1 + cos(7π/4))}^(1/2) a)l only b)I and II only