Question

Out of all these functions which ones are even?
y = sin x
y = csc x
y = sec x
y = cos x

Answer 1

even function : f(-x) = f(x)

can you do it now ?

Answer 2

y= cos x
y= sec x

Answer 3

@prawal don't give answers

Answer 4

Cool secto... when you say f(-x) = f(x) ..what do you mean?

Answer 5

for example x^2 is an even function since
f(-x) = (-x)^2 = x^2 = f(x)

Answer 6

how can f(-x) = f(x)?

Answer 7

@Zekarias @Coolsector already gave the explanation..
i do no see any need to do it again...

Answer 8

if f(-x) = f(x) then f(x) is an even function
i just gave you an example which f(x) = f(-x) so it is possible

Answer 9

OH sorryI misunderstood the explanation ..ty

Answer 10

even function are symmetric with respect to the y axis

Answer 11

ty

Answer 12

yw .. :)