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
Return the 3n+1 sequence for n
Generate N equally spaced intervals between -L and L
Alternately upper-lower case
Performance - summation
A shooting competition
Find the diagonal of the square of side L
Area of polygon
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