(a+b)^2/(a^2-b^2) = (a+b)/(a-b)
(1+sqrt(-1))/(1-sqrt(-1)) = sqrt(-1)
1/4*a = a/4
factor(factorial(6)) = 2^4*3^2*5
conjugate(1/2+sqrt(-1)) = 1/2-sqrt(-1)
(1 <= 2) => (3 > 4)
graph(sin(x*pi), x)