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Question

The angle between R=2^i+3^j4^k and y-axis is

A
cos1(229)
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B
cos1(329)
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C
sin1(329)
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D
tan1(329)
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Solution

The correct option is A cos1(329)
^j is the unit vector along y-axis
Required angle θ=cos1(2^i+3^j4^k)^j291=cos1329

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