Solve given expression.
Note that this problem uses the word solve when it needs to say EVALUATE.
Also the required code to pass the tests shouldn't be available by COPY-AND-PASTE from Test Suite!
Back to basics 23 - Triangular matrix
Sum of diagonal of a square matrix
select the primes of a vector
Output a vector which is table of 9
Increment up an input vector
Convert array of decimal numbers into hexadecimal numbers array.
Find the volume of cone
Display positive elements of matrix.
Find product of eigenvalues of n*n magic matrix.
Find cosine between two given vectors u and v.
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