find in which interval the function is strictly increasing and decreasing f(x)=1/4x⁴+2/3x³-5/2x²-6x+9
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f(x)=1/4x4+2/3x³-5/2x²-6x+9
f(x)=1+2x-5x2-6x3+9x4
f(x)=9x4-6x3-5x2+2x+1
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