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[" Let "alpha" be the angle which the ve...

[" Let "alpha" be the angle which the vector "vec V=2hat 1-hat j+2hat k],[" makes with the "z" -axis.Then,what is the value of "],[sin alpha" ? "],[[" (a) "2/3," (b) "1/3],[" (c) "sqrt(5/3)," (d) "sqrt(5)/9]]

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