Q. What is the period ofy=8cos(5πx+23π)−9?Give an exact value.units
Formula for cosine function period: The period of a cosine function of the form y=Acos(Bx+C)+D is given by the formula Period = ∣B∣2π. Here, A is the amplitude, B is the frequency, C is the phase shift, and D is the vertical shift.
Identifying the value of : Identify the value of in the given function . The value of B is the coefficient of x inside the cosine function, which is 555\pi.
Calculating the period: Calculate the period using the formula Period=2π∣B∣ \text{Period} = \frac{2\pi}{|B|} Period=∣B∣2π. Substitute B B B with 5π 5\pi 5π.\newlinePeriod=2π∣5π∣=2π5π \text{Period} = \frac{2\pi}{|5\pi|} = \frac{2\pi}{5\pi} Period=∣5π∣2π=5π2π.
Simplifying the expression: Simplify the expression for the period. Since π\piπ is in both the numerator and the denominator, they cancel each other out.\newlinePeriod = 25\frac{2}{5}52.
Exact value of the period: The exact value of the period of the function y=8cos(5πx+3π2)−9y = 8\cos(5\pi x + \frac{3\pi}{2}) - 9y=8cos(5πx+23π)−9 is 25\frac{2}{5}52 units.
More problems from Find the sum of a finite geometric series