Return x by differentiating it.
I'm confused by this problem. It requires the use of diff() and asks for differentiation, but it tests for equality with the input variable...
the author had proposed lots of questions with meaningless test. i despise this behavior
Arrange Vector in descending order
Back to basics 26 - Keywords
Getting the row and column location from a matrix
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Simple polynomial evaluation
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Non trivial identities - reshape
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