In the test cases you wrote "your_fcn_name(x)" and not "your_fcn_name(l,b,h)" ;-)
Find the sum of the elements in the "second" diagonal
Is it an Armstrong number?
Calculate the derivative of a polynomial
Count decimal digits of a number
Find the dimensions of a matrix
Find the square of the sum of the digits of a number
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Concatenate two strings
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