Answer to Question #255586 in Physics for Tahani

Question #255586

Find the angle between c and 2A if c=A+2B

Expert's answer

"\\cos \\alpha=\\frac{(2\\vec{A}\\cdot(\\vec{A}+2\\vec{B}))}{2A(A+2B)}\\\\\n\\cos \\alpha=\\frac{A^2+2\\vec{A}\\cdot\\vec{B}))}{A(A+2B)}"

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