Math Question: Find the 4th derivative of f(x) = sin^3(x).
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Question: Find the limit as x approaches a for f(x)/g(x), where f(x) and g(x) are both differentiable functions that approach 0/0.
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A clothing store sells shirts in two colors, red and blue. Out of 100 customers, if the probability of a customer buying a red shirt is 0.3, find the expected number of customers buying red shirts.