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Letveca and vecb be two unit vectors suc...

Let`veca` and `vecb` be two unit vectors such that `veca.vecb=0`. For some `x,y in R`, let `vecc = xveca + yvecb + (veca xx vecb)` . If `|vecc|=2` and the vector `vecc` is inclined at the same angle `angle` to both `veca` and `vecb`, then the value of `8cos^(2)alpha` is________________

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