Найдите значение выражения

cos2a/tga-ctga (если sina-cosa=1/корень из 2) .Решите уравнения [tex]1)x+6/\sqrt{x-2} =\sqrt{3x-2} \\2)3^{x-1} +3^{x} +3^{x+1} =13*3^{x^{2}-3 }[/tex]



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