Why does the values of sin x or cos x is always between 1 and -1?

Proof:- let sinx=2

(if this is exist then take we value of sinx is 2 otherwise this is proved values of sin x between 1 and -1.)

So using in this pythagorous theorem,

P=2

h=1

b=√(1^2)-(2^2)

b=√1–4

b=√-3(this is not exist so value of sinx or cosx always between -1 and 1) proved