(3x-x³)`=3-9x²3-3x²=03(1-x²)=0x²=1x=-1 U x=1 _ + _-----------------(-1)--------------(1)--------------убыв возр убыв
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(3x-x³)`=3-9x²
3-3x²=0
3(1-x²)=0
x²=1
x=-1 U x=1
_ + _
-----------------(-1)--------------(1)--------------
убыв возр убыв