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यदि वेक्टर vecA = cos omegat hati + sin ...

यदि वेक्टर `vecA = cos omegat hati + sin omegat hatj` तथा वेक्टर `vecB = cos""(omegat)/(2)hati + sin ""(omegat)/(2)hatj` समय के फलन है तब समय t का वह मान क्या होगा जिस पर ये वेक्टर परस्पर लंबकोणिक (orthogonal) होंगे :

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