(1 point) Answer the following questions for the function f(x) = sin defined on the interval [-18.55, 3.71]. Remember that you can enter pi for * as part of your answer. a.) f(x) is concave down on the region(S) b.) A global minimum for this function occurs at c.) A local maximum for this function which is not a global maximum occurs at d.) The function is increasing on the region(s) Note: In some cases, you may need to give a comma-separated list of intervals, and intervals should be given in interval notation