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I am finding the coordinates of stationary point of the equation y = x^4 - 2x^3 - 5x^2 + 6. First, I found y´ = 4x^3 - 6x^2 - 10x Then I was going to find all the x coordinates but now I am stumped. So I´ve got, 4x^3 - 6x^2 - 10x = 0 Then, 2x(2x^2 - 3x - 10) = 0 Now I am trying trial and...