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y=xsinx

sin(x+y)=x²/y

z=sinx+siny

 
z=xsinx+ysiny-8

z=xy/10(50-x²-y²)^1/2

z=-xsinx-ysinx-e^x/y

z=1/(xy)-e^sinx

 
z=abs(-x²-y²+8)/abs(xy)

z=-sinx+siny²+abs(-1/20(x²+y²))

z=sinx*2/y-y^e/x-1