answer the following question
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it's pretty simple, you only need to differentiate (1+x³)/3 with respect to x as that's how we find out the slope of a curve.
By differentiating you should get x²
Now this is equal to 4
=>x²=4
x=+√2 or x=-√2
By differentiating you should get x²
Now this is equal to 4
=>x²=4
x=+√2 or x=-√2
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