NTA Abhyas JEE Main2020MathematicsTrigonometric EquationsPractice
The value of x satisfying the equation sin x cos x + 2 + tan 2 x + cot 2 x = 3
Options
- Abelongs to 0 , π 3
- Bbelongs to π 3 , π 2
- Cbelongs to 3 π 4 , π
- Ddoes not exist
Correct answer
D. does not exist
Step-by-step solution
sin x cos x + 2 + tan 2 x + cot 2 x = 3 ⇒ sin x cos x + tan x + cot x 2 = 3 ⇒ sin x cos x + tan x + cot x = 3 ⇒ 1 2 sin 2 x + tan x + cot x = 3 ⇒ tan x 1 + tan 2 x + 1 + tan 2 x tan x = 3 Let t = tan x 1 + tan 2 x t + 1 t = 3 ⇒ t 2 - 3 t + 1 = 0 ⇒ D < 0 So, no real values of t Hence, x does not exists.