#choose the correct answer
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after you've finished your question, you can self-check your answer with ,calc derivative(...), for example
,calc derivative('2x^2/sqrt(1-x^3) + sin(exp(x))', 'x')
Result:
(4 * x + 3 * x ^ 4 / sqrt(1 - x ^ 3) ^ 2) / sqrt(1 - x ^ 3) + exp(x) * cos(exp(x))