Question: Hello, I need help with this problem. The answer is inside the box but I don't understand how to get the answer. The topic is
Hello, I need help with this problem. The answer is inside the box but I don't understand how to get the answer. The topic is Derivatives of Trigonometric Functions.

For problems 18-19, nd all values of as in the interval [0, 27r] where the graph of the given function has horizontal tangent lines
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