Вытручайте
3*7 div 2 mod 7/3 - trunc(sin(1))

3*7 div 2 mod 7/3 - trunc(sin(1)) = 21 div 2 mod 7/3 - trunc(sin(1)) =10 mod 7/3 - trunc(sin(1)) = 3/3 - trunc(0.8) = 1.0 - 0 = 1.0