trig!!
posted by Alice .
Sin(Xy)sin(x+y)=sin^2 x  sin^2 y
work on one side only...so i worked on the right
=(sinxsiny)(sinx+siny) does that equal
sin(xy)sin(x+y)??? help!

trig!! 
drwls
Duplicate post; already answered.
Refer to your previous post.
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