Find the general solution, in radians, of the equation cos2a + cos4a + cos6a = 0 I have this equation to play with: a = 2πn (+or-) α but i dont know what to do with it :S
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Originally Posted by djmccabie Find the general solution, in radians, of the equation cos2a + cos4a + cos6a = 0 I have this equation to play with: a = 2πn (+or-) α but i dont know what to do with it :S Hint:
Why is this true :S
Originally Posted by djmccabie Why is this true :S in general we have this identity: do you remember? now just put and and see what you get!
Originally Posted by NonCommAlg in general we have this identity: do you remember? No. I gotta teach myself a lot of the maths I haven't come across this thanks a lot! are there any more important ones i should be aware of? I have learned compound angle and double angle formulae
Last edited by mr fantastic; May 8th 2009 at 03:07 PM. Reason: Merged posts
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