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When is \(\cos^{-1}(\cos\theta)=\theta\) definitely true?\(\cos^{-1}(\cos\theta)=\theta\) कब निश्चित रूप से सत्य है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(\theta\in[0,\pi]\)\(\theta\in[0,\pi]\)
The principal output of (\cos^{-1}x) lies in ([0,\pi]). For equality, take (\theta) in that interval.(\cos^{-1}x) का principal output ([0,\pi]) में होता है। equality के लिए (\theta) को उसी interval में लें।
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