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Help with solving this equation

  1. Nov 20, 2006 #1
    Hi guys

    I was solving a problem and I am stuck at solving this equation.

    (sec x)^2 (tan x)^2 = 2
    since we know that (sec x)^2 = 1 + (tan x)^2

    [1 + (tan x)^2][(tan x)^2] = 2
    (tan x)^2 + (tan x)^4 - 2 = 0

    now what do i do...

    thanks in advance.
  2. jcsd
  3. Nov 20, 2006 #2
    Substitute "u = tan x" to get a quadratic.
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