NTA Abhyas JEE Main2020MathematicsInverse Trigonometric FunctionsPractice
If x satisfies the inequality t a n - 1 x 2 + 3 t a n - 1 x - 4 > 0 , then the complete set of values of x is
Options
- A- tan 4 , π 4
- B- ∞ , tan 4 ∪ π 4 , ∞
- Ctan 1 , ∞
- Dtan 4 , tan 1
Correct answer
C. tan 1 , ∞
Step-by-step solution
Let, t a n - 1 x = t the given inequality becomes t 2 + 3 t - 4 > 0 ⇒ t + 4 t - 1 > 0 ∴ t < - 4 or t > 1 t a n - 1 x < - 4 (not possible) or t a n - 1 x > 1 ⇒ x > tan 1