ddx(f+g)=dfdx+dgdx
ddx(cf)=cdfdx
ddx(fg)=fdgdx+gdfdx
ddx(fg)=gdfdx−fdgdxg2
[f(g(x))]′=f′(g(x))g′(x)
ddxsin(x)=cos(x)
ddxcos(x)=−sin(x)
ddxtan(x)=sec2(x)
ddxcot(x)=−csc2(x)
ddxsec(x)=sec(x)tan(x)
ddxcsc(x)=−csc(x)cot(x)