JEE Main202117 Mar 2021Evening ShiftMathematicsLimitsActual
The value of the limit lim θ → 0 tan π cos 2 θ sin 2 π sin 2 θ is equal to :
Options
- A- 1 2
- B- 1 4
- C0
- D1 4
Correct answer
A. - 1 2
Step-by-step solution
We have to find l = lim θ → 0 tan π cos 2 θ sin 2 π sin 2 θ Using sin 2 θ + cos 2 θ = 1 , we get ⇒ l = lim θ → 0 tan π 1 - sin 2 θ sin 2 π sin 2 θ ⇒ l = lim θ → 0 tan π - π sin 2 θ sin 2 π sin 2 θ Using tan π - θ = - tan θ , we get ⇒ l = lim θ → 0 - tan π sin 2 θ sin 2 π sin 2 θ ⇒ l = lim θ → 0 - tan π sin 2 θ π si