The trigonometric equation 4*tan^2x - 1 = 0 has to be solved.
4*tan^2x - 1 = 0
=> 4*tan^2x = 1
=> tan^2x = 1/4
=> tan x = 1/2 and tan x = -1/2
=> `x = tan^-1(1/2)` and `x = tan^-1(-1/2)`
=> x = 26 .56 + n*180 degrees and x = -26.56 + n*180 degrees
The solution of the equation `4*tan^2x - 1 = 0` is `+-26.56 + n*180` degrees where n is an integer.
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