Return the number of days in a given month in 2017. If the input is not a valid month number, return -1.
Input: m = 1
Outpu: d = 31
Input: m = 2
Output: d = 28
Input: m = 13
Output: d = -1
You cannot use IF statements
Sum of diagonal of a square matrix
Side of an equilateral triangle
Deleting an element in a matrix
MATLAB Basic: rounding
Approximate the cosine function
Sum of adjacent elements in a vector
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