Question

6. P=..
A 2!/3! B. 71/4! C. 7!/(4! 3!) D. 41/7! E. 31/7!

Answer 1

Given the function;

`y=(2)/(3)\cos ((4)/(7)x)+2`
`\begin{gathered} \text{But the frequency f is given as;} \\ f=(2\pi)/(T) \\ \text{Where T is the period} \\ f=(4)/(7) \end{gathered}`
`\begin{gathered} (4)/(7)=(2\pi)/(T) \\ 4T=14\pi \\ T=(14\pi)/(4) \\ T=(7\pi)/(2) \\ \end{gathered}`

CORRECT OPTION: A