Question

Find the cosine function with 7

Answer 1

Step-by-step explanation:

this is correct answer

Answer 2

Answer:

Let: f(x) = cos (ax+b)

Given: Period of f(x) = 7

∴ $\frac{2\pi }{|a|} = 7$ ⇒ |a| = $\frac{2\pi }{7}$ ⇒ a = ± $\frac{2\pi }{7}$

∴ f(x) = cos (± 2π/7 $x$ + b), where b ∈ R