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Find the scaslars alpha and beta if veca...

Find the scaslars `alpha and beta` if `vecaxx(vecbxxvecc)+(veca.vecb)vecb=(vec4-2beta-sinalpha)vecb+(beta^2-1)vecc and (vecc.vecc)veca=vecc` where `vecb and vecc` are non collinear and `alpha, beta` are scalars

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