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I have to write [tex] {\it sina}+{\it sinb}+\sin \left( a+b \right) [/tex] as a product.

Here is what I began with, then I got stuck...

[tex] 2\,\sin \left( (a+b)/2 \right) \cos \left( (a-b)/2 \right) +{\it sina}\,{\it cosb}+{\it cosa}\,{\it sinb} [/tex]

Anyone please can help me out, that would be great, thank you!

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# Homework Help: Writing a trig product

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