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XY -तल में X -अक्ष की धनात्मक दिशा के साथ वामावर्त दिशा में ` 30^(@)` का कोण बनाने वाला मात्रक सदिश लिखिय|

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XY -तल में X -अक्ष की धनात्मक दिशा के साथ वामावर्त दिशा में ` 30^(@)` का कोण बनाने वाला मात्रक सदिश लिखिय|
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यहाँ ` theta =30^(@)`
अभीष्ट मात्रक सदिश
` vec r=cos 30^(@) hati +sin 30^(@) hatj =(sqrt( 3))/( 2)hati +(1)/(2)hatj `
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