Q. What is the period of the function f(x)=−4cos(5x−9)−7 ?Give an exact value.units
Identify standard form: Identify the standard form of the cosine function to determine the period.The standard form of a cosine function is f(x)=A⋅cos(Bx−C)+D, where:- A is the amplitude,- B affects the period of the function,- C is the phase shift, and- D is the vertical shift.In the given function f(x)=−4⋅cos(5x−9)−7, we can see that B=5.
Calculate period: Calculate the period of the function using the value of B.The period of a cosine function is given by the formula Period=∣B∣2π.For the given function, B=5, so we calculate the period as follows:Period=∣5∣2π=52π.
Verify calculation: Verify that there are no mathematical errors in the calculation.The calculation of the period is straightforward and involves basic arithmetic. There are no mathematical errors in the calculation.
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