Question
Class 11MathematicsTrigonometric Functions

Solve the equation:

tanx + secx =√3

Verified Answer

tan x + sec x = √3

= sin x/cos x + 1/cos x

= (sin x + 1)/cos x

⇒ √3 cos x - sin x = 1

Divide both sides by 2:

= (√3/2) cos x - (1/2) sin x = 1/2

= cos π/6 cos x - sin π/6 sin x = 1/2

= cos (x + π/6) = cos π/3

x + π/6 = 2mπ ± π/3

x = 2mπ + π/3 - π/6

x = 2mπ + π/6, 2mπ - π/2

cos θ = cos (2mπ - π/2) = cos π/2 = 0, which is not wanted.

Therefore solution is θ = 2mπ + π/6