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Vr² = V₁² + V₂² + 2 V₁ V₂ cos Ф
Vr² / V₁² + V₂² + 2 V₁ V₂ = cos Ф
Vr² - 2 V₁ V₂ cos Ф / V₂² = V₁²
Vr² - 2 V₁ V₂ cos Ф / V₁² = V₂²
Espero haberte ayudado.