यदि  , और इस तरह से तीन सदिश हैं कि और   फिर के बराबर क्या है?

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UP TGT Mathematics 2021 Official Paper
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  1. 21
  2. -21
  3. 19

Answer (Detailed Solution Below)

Option 2 : -21
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UP TGT Arts Full Test 1
125 Qs. 500 Marks 120 Mins

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संकल्पना:

दो सदिश a और b के बिंदु गुणनफल को इस प्रकार परिभाषित किया गया है:

जहाँ θ सदिश a और b के बीच का कोण है।

दो सदिशों केबिंदु गुणनफल के कुछ गुण इस प्रकार हैं:

  • a.b = b.a (क्रमचयी)
  • a.(b + c) = a.b + a.c (वितरक)

दिया गया:

,

गणना:

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