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ThreeVPNproviders-Astrill, StrongVPN and Golden Frog-claimed last week that their services had been disrupted and become unavailable for users on the Chinese mainland...
2, the cosine law is expressed by the formula (2) with gij = xij + xikxjk + ximxjm + xkm(xikxjm + ximxjk − xijxkm), gii = 1 − (x2jk + x2jm + x2km) − 2xjkxjmxkm...