Answer-if 7 sin 2 x + 2 cos 2 x = 4 then find tan x

7 sin 2 x 2 cos 2 x 4 ----- 1 Now we know that sin2 x cos2 x 1 or 7 sin2 x 7 cos2 x 7 ----2, So by solving equation 1 2, we will get, cos2 x or cosx Putting the value of cosx in equation 1, we will get sin x so tan x