Duplicate all elements in the array
The solution to this problem doesn't make any sense!!!
If you are using the word "duplicate" to mean multiply by 2, then the correct answer is [2,4,6], not [1,4,6]
Angle between Two Vectors
subtract central cross
Deleting an element in a matrix
Converts numbers into characters
Calculate the average value of the elements in the array
Calculate the square root of a number
calculate the length of matrix
Find the max element of the array
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