( 1) Sqr(x*x+y*y)

(2)cos(30*3. 14 15926/ 180)^2-sin(30*3. 14 15926/ 180)^2

(3) 1+(x/( 1+(x/( 1+x))))

(4)log(x)/log( 10)+exp(3)/x ^(2/3)

(5) Sqr(Abs(2*x 1 + 3*x2*x3))

(6)log((exp(x*y)+abs(atn(z)+sin(x)^3))/(x+y+z)