Find the exact value of tan 2x if tan x=7/11, and pi[latex] \leq [/latex]x[latex] \leq [/latex] 3pi/2

this is the concept of trigonometry, by trigonometric rules: tan 2x=[2tan x]/[1-tan^2 x] given that tan x=7/11 then: tan 2x=[2*7/11]/[1-(7/11)^2] =[14/11]/[1-49/121] =[14/11]/[72/121] =77/36