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Use partial fractions to find
a. ∫x²+x+6/x⁴+12x²-36 dx=(1/√6) arctan(x/√6)-1/2(x²+6)+C
b. ∫x²+x+6/x⁴+12x²-36 dx=1/2(x²+12)+C
c. ∫x²+x+6/x⁴+12x²-36 dx=(1/√6) arctan(x/√6)+C
d. ∫x²+x+6/x⁴+12x²-36 dx=artcat(2√3)-1/2(x²+6)+C