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AysviL [449]
2 years ago
10

What is the period of y = 8 cos (5pie x + 3pie/2)-9 Give an exact value. Units

Mathematics
2 answers:
bekas [8.4K]2 years ago
7 0

Answer:

\textsf{Period}=\dfrac{2}{5}

Step-by-step explanation:

<u>Standard form of a cosine function:</u>

f(x) = A cos(B(x + C)) + D

  • A = amplitude (height from the mid-line to the peak)
  • 2π/B = period (horizontal distance between consecutive peaks)
  • C = phase shift (horizontal shift - positive is to the left)
  • D = vertical shift

Given function:

      y= 8 \cos \left(5 \pi x+\dfrac{3 \pi}{2}\right)-9

\implies y= 8 \cos \left(5 \pi \left(x+\dfrac{3}{10}\right)\right)-9

Comparing with the standard form:

\implies \textsf{B}=5 \pi

\implies \textsf{Period}=\dfrac{2 \pi}{\sf B}=\dfrac{2 \pi}{5 \pi}=\dfrac{2}{5}

zzz [600]2 years ago
3 0

\\ \rm\Rrightarrow y=Acos(Bx+C)+D

  • This is the general formula and the period is 2π/B

Now our given function

\\ \rm\Rrightarrow y=8cos\left(5\pi x+\dfrac{3\pi}{2}\right)-9

On comparing we get

  • A=8
  • B=5π
  • C=3π/2
  • D=-9

Period:-

\\ \rm\Rrightarrow \dfrac{2\pi}{B}

\\ \rm\Rrightarrow \dfrac{2\pi}{5\pi}

\\ \rm\Rrightarrow \dfrac{2}{5}

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