a$.$The normalised binary FSK $$signals are given by

g$0($t$)=2$Tsin$($$1$t$)$w$($t$)$

g$1($t$)=2$Tsin$($$1$t$)$w$($t$)$where$,$ w$($t$)=\{1,0$t$$T$0,$elsewhere$$

Show that the above stated BFSK $$are orthogonal when

$1-$$2=2$T $$and $1+$$2=$K$2$T $$for some integer K$.$