The unit vector in the direction of A-3 -4 - is -

The correct option is B Â=3î+4ĵ/5 | A⃗ #160;| =√( 3 ^ 2 + 4 ^ 2 ) =5 Â =( 3 î + 4 ĵ #160;) #160; 5 ...

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Pascal Triangle

The unit vect...

Question

The unit vector in the direction of $\to A = 3^i + 4^j$ is :

^A = \frac{^i +^j}{7}

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^A = \frac{3^i + 4^j}{5}

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^A =^i +^j

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^A = \frac{4^i - 3^j}{5}

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Solution

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\to a =^i -^j

\to b =^i + 2^j

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^b

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^i \times ((^a -^j) \times^i) +^j \times ((^a -^k) \times^j) +^k \times ((^a -^i) \times^k) = \to 0

\to a = x^i + y^j + z^k,

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^i -^j,^j +^k

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\to a = 3^i + 4^j

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^i - 3^j + 5^k

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