y=1/2sin2x+(1-cos2x)/2
=1/2(sin2x-cos2x)+1/2
=√2/2*(√2/2*sin2x+√2/2zos2x)+1/2
=√2/2*(sin2xzosπ/4+cos2xsinπ/4)+1/2
=√2/2*sin(2x+π/4)+1/2
-1