sin(x)+cos(y)

sin(x^2+3*y^2)/(x^2+y^2)+(x^2+5*y^2)*exp(1-x^2-y^2)/2

cos(x*y)*sin(x+y)

x*y*exp((0-.5)*((x^2)+(y^2)))

abs(x)*abs(y)

1/(1+sqr(abs(y-sin(x)))+sqr(abs(x+sin(y))))

sin(sqr((x^2)+(y^2)))

cos(x*y)