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Question: How to get the only solution x = (1/6)*sqrt(114)*a of this equation

Question:How to get the only solution x = (1/6)*sqrt(114)*a of this equation

minhthien2016 325 Maple
June 22 2019
1

How to get the only solution x = (1/6)*sqrt(114)*a of this equation?
restart;
with(Student:-MultivariateCalculus);
u := `<,>`(-(1/4)*a, -(1/12)*sqrt(3)*a, -x);
v := `<,>`(-(1/2)*a, (1/6)*sqrt(3)*a, (1/2)*x);
`assuming`([solve(Angle(u, v) = arccos(2*sqrt(26)*(1/13)), x)], [And(a > 0, x > 0)])
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