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
Remove the vowels
Find the largest value in the 3D matrix
Add two numbers
Count up then down
Area of rhombus
Non trivial identities - summation
Probabilities - More brains than luck
Simple polynomial evaluation
Performance - summation
A shooting competition
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