Question

The cosine function having period 2/5 is​

Answer 1

Answer: cos(5$\pi$x)

Step-by-step explanation:

period of cosx is 2$\pi$ so period of cos(5$\pi$x) is 2/5.

put x+2/5 ⇒ cos(5$\pi$x + 5$\pi$*2/5) =cos(5$\pi$x +2$\pi$) = cos(5$\pi$x)