prove that , sin(x) sin(2x) sin(3x)

i am not clear about that
 

i mean what to prove it ? I mean is it equal to 0 or something else

well, question is : prove that , sin(x) sin(2x) sin(3x)

something wrong here, some bug or something , question statement got truncated when i posted (both the times – i posted twice)

prove sin(x)sin(2x)sin(3x)

is less than 9/16 is question

prove sin(x)sin(2x)sin(3x)is less than 9/16 is question

what we have to prove?give the right hand equation or value.so give the right hand value or equation as early as possible i will try to give the answer