Question

The period of cos 5 is *

²

2

2/5

/3

Only tell correct answer​

Answer 1

answer for your question is 2 / 5

Period of coskx=∣k∣2π as given period =5=∣k∣2π

∴∣k∣=52π

k=±52π

∴ This gives f(x)=coskx=cos(±52πx)