Asked by Robby

Find the value of b, if any, that will make the function differentiable at x = 0

g(x)= { x+b, x<0
cos(x), x≥0

can you help, I got 0 but I don't know if that will make the function differential at x=0.

Answers

Answered by Manny
On APEX the answer is: No such value exists

I'm pretty sure this is because for any value you put for b the graph of the function at x=0 is either discontinuous (so it can't be differentiable) or forms a corner, which basically means the function does not approach the same tangent line at the corner from the left- and right-hand sides. Therefore the function is not differentiable at that point.

Hope this was helpful
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