Count the number of occurrences of the second input in the first input
x1 = 12344455511; x2 =2; output = 1
x1 = 12344455511; x2 =1; output = 3
Find common elements in matrix rows
How to find the position of an element in a vector without using the find function
Energy of a photon
Create tangent function out of sine function only
Create sine function out of cosine
Refresh your system of equations
Get all prime factors
Create tangent function out of sin and cos
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