Resolva as equações biquadradas
a) x^4 + 5x^2 = - 6
b) x^2 - (x^2 - 5)^2 = 3
c) (x^2 - 1)^2 + (x^2 - 5)^2 = 40
d) 9x^2 + 3/x^2 = 28
e) 6/x^2 - 8 = 1/x^4​
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