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September 16th, 2009, 02:58 PM  #1 
Newbie Joined: Sep 2009 Posts: 5 Thanks: 0  Multiple Choice Problem on Using DoubleAngle Formulas
Hi, I've been trying to solve this question, and I just can't get an answer that looks like one of the choices given. Could anyone walk me through the question or give me a hint that might lead me to the right answer? Thank you very much! The question is: Use doubleangle formulas to rewrite the following expression in terms of the first power of cosine: sin^4(6x) a) (1/2)[3/4  cos(24x) + (1/4)cos(12x)] b) (1/2)[3/4  cos(12x) + (1/4)cos(24x)] c) (1/2)[3/4 + cos(12x) + (1/4)cos(24x)] d) (1/2)[3/4 + cos(12x)  (1/4)cos(24x)] e) (1/2)[3/4 + cos(24x)  (1/4)cos(12x)] 
September 16th, 2009, 03:41 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,950 Thanks: 1141 Math Focus: Elementary mathematics and beyond  

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