trig identities


elucidate the following: 1. ((sec^2x)(cscx))/(sec^2x+csc^2x) 2. ((tan^2x)/(secx+1))+1 verify the following: 1. ((cotx)/(cscx-1))=((cscx+1)/(cotx)) 2. (csc^4x-cot^4x)=(2csc^2x-1)