My Math Forum Multiple Choice Problem on Using Double-Angle Formulas

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 September 16th, 2009, 02:58 PM #1 Newbie   Joined: Sep 2009 Posts: 5 Thanks: 0 Multiple Choice Problem on Using Double-Angle 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 double-angle 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: 7,968 Thanks: 1152 Math Focus: Elementary mathematics and beyond

 Tags choice, doubleangle, formulas, multiple, problem

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### the multiple choice on double angles

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