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Which expression does not give a real number?कौन सा व्यंजक वास्तविक संख्या नहीं देता?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(\cos^{-1}\left(\frac{7}{6}\right)\)\(\cos^{-1}\left(\frac{7}{6}\right)\)
The expression \(\cos^{-1}x\) is real only for \(x\in[-1,1]\), and \(\frac{7}{6}>1\). Hence it will not give a real value.\(\cos^{-1}x\) केवल \(x\in[-1,1]\) पर वास्तविक है और \(\frac{7}{6}>1\) है। इसलिए यह वास्तविक मान नहीं देगा।
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