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Question : 140 of 150
Marks:
+1,
-0
Solution:
Let vector
vec‌a is coplanar with
+2− and
2++3 ∴=λ(+2−) +µ(2++3) =(λ+2µ)+(2λ+µ) +(−λ+3µ) Since,
a is orthogonal to
++ ∴λ+2µ+2λ+µ−λ+3µ=0 ⇒2λ+6µ=0⇒λ=−3µ ∴=−−5µ+6µ =−µ(+5+6) Again,
|a|=1 ∴µ2(1+25+36)=1 ⇒µ=±√ ∴a=
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