# simply the expression as far as possible

• December 14th 2009, 08:12 PM
alessandromangione
simply 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?
• December 15th 2009, 03:33 AM
Raoh
Quote:

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

$4\sin x \cos x=2\left ( 2\sin x\cos x \right )=2\sin2x$.
• December 15th 2009, 01:02 PM
alessandromangione
oh thanks...it was so easy haha