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$ А cos \varphi =\frac{V^{2}+U^{2}}{V^{2}-U^{2}}  Б  cos \varphi =\frac{V^{2}-U^{2}}{V^{2}+U^{2}} В  cos \varphi =\frac{U^{2}+V^{2}}{U-V}  Г  cos \varphi =\frac{V^{2}-U}{V+U}  $
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