Recent content by stevensen

Homework Statement Use the chain rule, the derivative formula Dxsinu=cosuDxu, together with the identities cosx=sin(\pi/2 -x) and sinx=cos(\pi/2 -x) to obtain the fomula for Dxcosx. Homework Equations Chain rule: dy/dx=dy/du\cdotdu/dx The Attempt at a Solution For my second...

Thanks. I finally figured it out.

Homework Statement Prove: cotAcotB=(cscB+cotA)/(tanAsecB+tanB) Homework Equations cotx=1/tanx, etc. I tried using pythagorean identities, like 1+cot2x=csc2x, and others, but I've been unable to solve the problem. The Attempt at a Solution Please help me out. The examples in my...