\(\tan^{-1}(\tan\theta)=\theta\) कब निश्चित रूप से सत्य है?
When is \(\tan^{-1}(\tan\theta)=\theta\) definitely true?
Explanation opens after your attempt
B. \(\theta\in(-\frac{\pi}{2},\frac{\pi}{2})\)
Concept
The principal range of \(\tan^{-1}x\) is (\(-\frac{\pi}{2},\frac{\pi}{2}\)). Since \(\tan\) is periodic, the principal interval is necessary.
Why this answer is correct
The correct answer is B. \(\theta\in(-\frac{\pi}{2},\frac{\pi}{2})\). The principal range of \(\tan^{-1}x\) is (\(-\frac{\pi}{2},\frac{\pi}{2}\)). Since \(\tan\) is periodic, the principal interval is necessary.
Exam Tip
\(\tan^{-1}x\) का principal range \((-\frac{\pi}{2},\frac{\pi}{2})\) है। \(\tan\) period वाला है, इसलिए principal interval जरूरी है।
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