Resolva as equações biquadradas em r
a) x elevado a 4 + 6x² + 8 =0
b) 9x elevado a 4 - 13x² + 4 =0
c) x elevado a 4\2 - x²-1/3 =7
d) (x²-3)² = (x+1) (x-1)
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