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D( x )
7*x^2-8 = 0
7*x^2-8 = 0
7*x^2-8 = 0
7*x^2 = 8 // : 7
x^2 = 8/7
x^2 = 8/7 // ^ 1/2
abs(x) = (8/7)^(1/2)
x = (8/7)^(1/2) or x = -(8/7)^(1/2)
x in (-oo:-(8/7)^(1/2)) U (-(8/7)^(1/2):(8/7)^(1/2)) U ((8/7)^(1/2):+oo)
y = pi/(7*x^2-8) // - pi/(7*x^2-8)
y-(pi/(7*x^2-8)) = 0
(-1*pi)/(7*x^2-8)+y = 0
(-1*pi)/(7*x^2-8)+(y*(7*x^2-8))/(7*x^2-8) = 0
y*(7*x^2-8)-1*pi = 0
7*x^2*y-8*y-pi = 0
(7*x^2*y-8*y-pi)/(7*x^2-8) = 0
(7*x^2*y-8*y-pi)/(7*x^2-8) = 0 // * 7*x^2-8
7*x^2*y-8*y-pi = 0
7*x^2*y = -(-8*y-pi) // : 7*y
x^2 = (pi-(-8*y))/(7*y)
x^2 = (8*y+pi)/(7*y) // ^ 1/2
abs(x) = ((8*y+pi)^(1/2))/(7^(1/2)*y^(1/2))
x = ((8*y+pi)^(1/2))/(7^(1/2)*y^(1/2)) or x = -(((8*y+pi)^(1/2))/(7^(1/2)*y^(1/2)))
x in { ((8*y+pi)^(1/2))/(7^(1/2)*y^(1/2)), -(((8*y+pi)^(1/2))/(7^(1/2)*y^(1/2))) }
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