4. 6^(-x) * x^2 + 36*6^(√x) - x^2 * 6^(√x) - 36*6^(-x)=0
6^(√x) * (36-x^2) + 6^(-x) * (x^2 - 36) = 0
(36 - x^2 ) * (6^(√x) + 6^ (-x)) = 0
36 - x^2 = 0 x=+-6
6^(√x) + 6^(-x) = 0 √x = -x ∅
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4. 6^(-x) * x^2 + 36*6^(√x) - x^2 * 6^(√x) - 36*6^(-x)=0
6^(√x) * (36-x^2) + 6^(-x) * (x^2 - 36) = 0
(36 - x^2 ) * (6^(√x) + 6^ (-x)) = 0
36 - x^2 = 0 x=+-6
6^(√x) + 6^(-x) = 0 √x = -x ∅