SOLUTION: Consider the function {{{f(x)=(5/2)cos(2x-(pi/2))}}}. For what values of k will the equation f(x)=k have no solutions?

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Question 979622: Consider the function f%28x%29=%285%2F2%29cos%282x-%28pi%2F2%29%29. For what values of k will the equation f(x)=k have no solutions?
Answer by Fombitz(32388) About Me  (Show Source):