Question: If and exist but are not equal, then is not differentiable at c, and the graph of has a corner at c. Prove

If lim h0- f(c+h)-f(c) hand lim f(c+h)-f(c) h0+ h exist but are not equal, then ƒ is not differentiable at c, and the graph of ƒ has a corner at c. Prove that f is continuous at c.

lim h0- f(c+h)-f(c) h

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