NTA Abhyas JEE Main2020MathematicsTrigonometric Ratios & IdentitiesPractice
If 1 + cos 2 x sin 2 x + 3 1 + tan x tan x 2 sin x = 4 , then the value of tan x can be equal to
Options
- A2
- B1 2
- C3
- D1 3
Correct answer
D. 1 3
Step-by-step solution
2 cos 2 ⁡ x 2 sin ⁡ x cos ⁡ x + 3 cos ⁡ x cos ⁡ x 2 + sin ⁡ x sin ⁡ x 2 cos ⁡ x cos ⁡ x 2 sin ⁡ x = 4 ⇒ cot ⁡ x + 3 cos ⁡ x 2 cos ⁡ x cos ⁡ x 2 sin ⁡ x = 4 ⇒ cot ⁡ x + 3 tan ⁡ x = 4 ⇒ 3 tan 2 ⁡ x - 4 tan ⁡ x + 1 = 0 ⇒ tan ⁡ x = 1 3 or 1