Question: How to force half angle formula


I have a two expressions...

on in terms of

sin(1/2*B*L) and sinh(1/2*B*L)

and another in terms of

sin(B*L) and sinh(B*L)


I'd like to use a half angle formula on the first to get it in terms of "B*L", then make a substitution into the second...I can't seem to figure out how to make maple do a 1/2 angle expansion....


any suggestions?

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