Description: This procedure can be implemented:
1) the common arithmetic (+ - * /), triangular (sin (), cos (), tan (), cot ()), the triangle (asin (), a cosine (), atan (), acot ()), power (^), prescribing (SQRT ()), index (exp ()), the logarithmic (ln (), log ()).
2) support variable assignment, variable coverage and operation.
3) support simple assignment of vector + -. * and common vectors.
I hope that you can improve after your reference! Optimize the code!
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