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 November 14th, 2017, 03:21 AM #1 Newbie   Joined: Nov 2017 From: Dresden, Saxony, Germany Posts: 2 Thanks: 0 Trigonometrical Equation, don't know how to simplify it Hi everyone. I have an expression -cos(f)*(sin(g)*cos(m)*cos(l) + sin(g)*sin(m)*sin(l)) + cos(g)*sin(f) which is equal to cos(g)*sin(f) - cos(f)*sin(g)*cos(l - m) according to Wolfram Alpha's CAS. I have no clue how to get there. Thanks in advance, Peter Last edited by skipjack; November 14th, 2017 at 04:09 AM. November 14th, 2017, 04:08 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,919 Thanks: 2203 -cos(f)*(sin(g)*cos(m)*cos(l) + sin(g)*sin(m)*sin(l)) = -sin(g)cos(f)(cos(m)cos(l) + sin(m)sin(l)) = -sin(g)cos(f)cos(l - m) Now add cos(g)sin(f) to both sides. November 16th, 2017, 02:08 AM #3 Newbie   Joined: Nov 2017 From: Dresden, Saxony, Germany Posts: 2 Thanks: 0 Thank you so much skipjack  Tags equation, simplify, trigonometrical Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Lucas Webb Calculus 4 March 2nd, 2016 02:13 AM Lucas Webb Calculus 4 February 29th, 2016 06:14 PM Vale Trigonometry 3 January 7th, 2014 11:25 PM azelio Algebra 3 October 24th, 2010 05:45 PM co461 Algebra 4 April 25th, 2008 05:36 AM

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