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Here it is

For the func.

f(x) = { 0 x < or/and = 0

2x +1 x > 0

Proove that f(x) is not differentiable at x=0

Also

2. A two piece ladder leaning against a wall is collapsing at a rate of 2 ft/sec while the foot of the ladder remains a constant 5 ft from the wall. How fast is the ladder moving down the wall when the ladder is 13 ft long?

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# Prove that f(x) is not differentiable at x=0

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