Find vecor x.
Whether the input is vector?
Set the array elements whose value is 13 to 0
Add two numbers
07 - Common functions and indexing 3
Are you in XY plane?
Return ! if array element starts with a certain letter. Otherwise return ?
Numerate input arguments
Create cotangent function out of sine.
Find matrix of indices for multidimensional matrix.
Check if a string starts with another string
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