Question

let A=[-1,1] =B then which of the following function from A to B is bijective function​

Answer 1

k(x)=sin π/2

For f(x), co-domain will be confined to[ -1/2,1/2]

g(x)=∣x∣, co-domain is [0,1]

h(x)=x², co-domain is [0,1]

K(x)=sin πx/2 , co-domain is [−1,1] and it is also one one in the same domain.

Hence K(x) is bijective functionm