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ok so a x cos(alpha)=b x cos(beta)
how to certify that the triangle where alpha and beta angles are is Isosceles???? this is how i solved the problem
:(from the concludion we can say that alpha and beta are = and that a and b are also equal=>cos alpha=cos beta.....thus means that axcos(alpha)=bxcos(beta).........................is this valid???(thnx for reading and sorry for my bad english :S:S:S
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