Urči derivaci zadané funkce:
\( j(x)=\sin x+\cos x-x^{3} \)
\( j^{\prime}(x)=\cos x+\sin x-3 x^{3} \)
\( j^{\prime}(x)=\sin x+\cos x-3 x^{2} \)
\( j^{\prime}(x)=\cos x-\sin x-3 x^{2} \)
\( j^{\prime}(x)=\cos x-\sin x-2 x^{2} \)
