Question

5. The period of cos 5 is *
O O
X2
20
021/5
O 1/3​

Answer 1

Answer:

○21/5

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Answer 2

Answer:

f(x)=cosx

2

as, x

2

≥0

For periodic function graph should be plotted on both sides of Y-axis.

But x

2

<0 cannot happen, so that cosx

2

is non periodic function.

Explanation - II :

For periodic function f(x)

f(x+T)=f(x) [T is period of f(x)]

Let f(x)=cosx

2

∴cos(x+T)

2

=cos(x)

2

⇒(x

2

+T

2

+2xT)



=cos(x)

2

not possible

Period of cosx

2

does not exist.