Urči derivaci funkce f(x)=\sin\:x\cdot\cos\:x.
f^{\prime}(x)=2\sin x\cos x=\sin 2x
f^{\prime}(x)=\sin ^{2} x+\cos ^{2} x=1
f^{\prime}(x)=\sin x - \cos x
f^{\prime}(x)=\cos ^{2} x-\sin ^{2} x=\cos 2 x
