Let ` veca ,vecb , vecc` be three unit vectors such that angle between ` veca and

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Let ` veca ,vecb , vecc` be three unit vectors such that angle between ` veca and vecb is alpha , vecb and vecc " is " beta and vecc and veca " is " gamma. " if " | veca. + vecb + vecc| =2` , then ` cos alpha + cos beta + cos beta ` =
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