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If veca=3hati-hatj+5hatk and vecb=hati+2...

If `veca=3hati-hatj+5hatk` and `vecb=hati+2hatj-3hatk` are given vectors. A vector `vecc` which is perpendicular to z-axis satisfying `vecc.veca=9` and `vecc.vecb=-4`. If inclination of `vecc` with x-axis and y-axis and y-axis is `alpha` and `beta` respectively, then which of the following is not true?

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