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Prove that abbcca[a→-b→,b→-c→,c→-a→] = 0 - Mathematics

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प्रश्न

Prove that `[vec"a" - vec"b", vec"b" - vec"c", vec"c" - vec"a"]` = 0

योग
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उत्तर

`[vec"a" - vec"b", vec"b" - vec"c", vec"c" - vec"a"] = (vec"a" - vec"b")*[(vec"b" - vec"c") xx (vec"c" - vec"a")]`

= `(vec"a" - vec"b")*[vec"b" xx vec"c" - vec"b" xx vec"a" - vec"c" xx vec"c" + vec"c" xx vec"a"]`

= `vec"a"*(vec"b" xx vec"c") - vec"a"*(vec"b" xx vec"a") - vec"a"*(vec"c" xx vec"c") + vec"a"*(vec"c" xx vec"a") - vec"b"*(vec"b" xx vec"c") + vec"b"*(vec"b" xx vec"a") + vec"b"*(vec"c" xx vec"c") - vec"b"*(vec"c" xx vec"a")`

= `vec"a"*(vec"b" xx vec"c") - 0 - 0 + 0 - 0 + 0 + 0 - vec"b"*(vec"c" xx vec"a")`

= `[vec"a", vec"b", vec"c"] - [vec"a", vec"b", vec"c"]` = 0

Hence proved.

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Vector Triple Product
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 6: Applications of Vector Algebra - Exercise 6.3 [पृष्ठ २४२]

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सामाचीर कलवी Mathematics - Volume 1 and 2 [English] Class 12 TN Board
अध्याय 6 Applications of Vector Algebra
Exercise 6.3 | Q 3 | पृष्ठ २४२

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