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If (\cos^{-1}x=\frac{2\pi}{3}), what is the value of (x)?यदि (\cos^{-1}x=\frac{2\pi}{3}), तो (x) का मान क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (-\frac{1}{2})(-\frac{1}{2})
From (\cos^{-1}x=\frac{2\pi}{3}), (x=\cos\frac{2\pi}{3}=-\frac{1}{2}). Decide the sign from the quadrant of the angle.(\cos^{-1}x=\frac{2\pi}{3}) से (x=\cos\frac{2\pi}{3}=-\frac{1}{2})। कोण के चतुर्थांश से चिह्न तय करें।
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