Question

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Answer 1

Answer:

y = d + a · cos(bx - c) ⇒ y = -4cos(4/3x)

• a = -4
• b = 4/3
• c = 0
• d = 0

Amplitude = |a| = |-4| = 4

Period = $\frac{2\pi }{b} =\frac{2\pi }{\frac{4}{3} } =2\pi *\frac{3}{4} =\frac{3}{2} \pi$