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!
Sum of diagonal of a square matrix
Flip the main diagonal of a matrix
Side of a rhombus
Decide whether determinant is zero.
Calculate the values of a polynomial.
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Solve expression III
Convert array of decimal numbers into hexadecimal numbers array.
Delete x value in given vector y.
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