Posted by Matthew on .
prove identity
Sin2x  sinx/cosx + cos2x= sinx/cosx + 1

Math 
Reiny,
You typed it incorrectly, you must mean:
(sin(2x)  sinx)/(cosx + cos(2x)) = sinx/(cosx + 1)
LS = (2sinxcosx  sinx)/(cosx + 2cos^2 x  1)
= sinx(2cosx 1)/( (2cosx  1)(cosx+1) )
= sinx/(cosx + 1)
= RS