(\cos^{-1}\(\cos x\)=x) कब सीधे सही माना जा सकता है?
When can (\cos^{-1}\(\cos x\)=x) be directly true?
Explanation opens after your attempt
A. जब \(x\in[0,\pi]\)When \(x\in[0,\pi]\)
Concept
The principal range of \(\cos^{-1}x\) is \([0,\pi]\). Therefore (\cos^{-1}\(\cos x\)=x) applies directly only in this range.
Why this answer is correct
The correct answer is A. जब \(x\in[0,\pi]\) / When \(x\in[0,\pi]\). The principal range of \(\cos^{-1}x\) is \([0,\pi]\). Therefore (\cos^{-1}\(\cos x\)=x) applies directly only in this range.
Exam Tip
\(\cos^{-1}x\) की प्रधान सीमा \([0,\pi]\) है। इसलिए (\cos^{-1}\(\cos x\)=x) इसी सीमा में सीधे लागू होता है।
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