y = -9
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Since the range of the cosine function is (-1,1), the function y = cos(x) assumes a minimum value of -1 for y.
There is no minimum value for the cosecant function.
A global minimum is a point where the function has its lowest value - nowhere else does the function have a lower value. A local minimum is a point where the function has its lowest value for a certain surrounding - no nearby points have a lower value.
the maximum or minimum value of a continuous function on a set.
Yes if it is positive