Question: The problems in Exercises, are called self-answering problems because the answers are embedded in the question. For example, how many ways can you arrange the

The problems in Exercises, are called self-answering problems because the answers are embedded in the question. For example, how many ways can you arrange the letters in the word “six”? The answer is six.

The cost of a widget varies according to the formula C′(t) = -sin t. At time t = 0, the cost is $1. For arbitrary time t, determine a formula for the cost.

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