i don't understand how 4 sin x cos x can be simplified into 2 sin 4x....can anyone show me the process?

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- Dec 14th 2009, 09:12 PMalessandromangionesimply the expression as far as possible
i don't understand how 4 sin x cos x can be simplified into 2 sin 4x....can anyone show me the process?

- Dec 15th 2009, 04:33 AMRaoh
- Dec 15th 2009, 02:02 PMalessandromangione
oh thanks...it was so easy haha