sinx-cosy=0/sin²(x)+cos²(y)=2

sinx-cosy=0⇒sinx=cosysin²x+cos²y=2cos²y+cos²y=2cos²y=1⇒cosy=-1U cosy=1(1+cos2y)/2=11+cos2y=2cos2y=12y=2πny=πn1)sinx=-1⇒x=-π/4+2πn2)sinx=1⇒x=π/4+2πn