Recent content by skcollins

  1. S

    MHB How to Prove a Trigonometric Identity Involving x, y, and z?

    If xy+yz+zx=1 then prove (x^2-1)(y^2-1)/xy+(y^2-1)(z^2-1)/yz+(z^2-1)(x^2-1)/zx=4 with trigonometric identities such as cotAcotB+cotBcotC+cotCcotA=1