Question

Which of the following is not an even function?
O f(x) = cos?
O f(x) = 1 x + x +
O f(x) = 3 cosx-2 secx
O None of these​

Answer 1

Answer: f(x) = 1 x+ x+

Step-by-step explanation:

Even function:

A function f(x) is said to be an even function when

f(-x)=f(x).

here,

cos(-x)=cosx

and

3cos(-x)-2sec(-x)=3cos(x)-2sec(x)

therefore,

they are even function.

and

f(-x)= -1x-x =-(1 x+x)=-f(x)

it is an odd fuction