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If veca= 2hati+3hatj-4hatk, vecb=3hati-4...

If `veca= 2hati+3hatj-4hatk, vecb=3hati-4hatj-5hatk" and "vecc= -3hati+2hatj+3hatk`, find the magnitude and direction cosines of `veca+vecb+vecc`.

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