Can anyone help me verify these two identities
1. csc2x= 1/2 secx cscx I am not sure how to start this one
My second one I am not sure if I have done it right?
(sinx+cosx)^2-1= sin2x
(sinx+cosx) (sinx+cosx)-1
sinx^2+sinxcosx+sinxcosx+cosx^2-1
1+2sincosx-1=sin2x
2sinxcosx=sin2x
sin2x=sin2x Did I do this right?