calculus
posted by Tiffany .
Which of the following are antiderivatives of f(x)=sinxcosx?
I f(x)=(sin^2* x)/2
II f(x)=(cos^2* x)/2
III f(x)=cos(2x)/4

Why don't you in your head take the derivate of the answers?
d sin^2 x/2= 1/2 sinx cosx * 2 
1 and 3