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

2 answers

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
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