Example 1
Write an equation of the form 𝑓𝑥=𝑎cos𝑏𝑥+𝑐+𝑑 that uses a negative value of 𝑎.
Over the interval 54<𝑥<60, 𝑓𝑥 is...
(A) Positive and Increasing
(B) Positive and Decreasing
(C) Negative and Increasing
(D) Negative and Decreasing
Find an expression for all 𝑥-values at which this graph has points of inflection