anonymous
  • anonymous
Okay here is the deal, I am studying to test out of two math classes, I need someone to show step by step how to Sum of products in trig and Cos laws I have problems this not a the test. i am only studying. I will be attending IU east on-line this summer studying math. Please show me how to do it not give me answers only thanks.
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
here is the problem cos6x+cos2x=0
anonymous
  • anonymous
sin2xcos2x-cos2x=0
inkyvoyd
  • inkyvoyd
two tips that are meant as general self study guidelines: sign up for a free account on wolfram alpha, and use step-by-step solution after entering equations. Use resources such as Khan Academy, Purple Math (I believe), Wikipedia, and SOS math (I believe). I think paul's online math notes has good info too. Note that I have given you 7ish names and no links - trust me, these worked for me, especially the first, if you do not have openstudy to help you. Good luck, and have fun!

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anonymous
  • anonymous
Youtube also has some good math videos. Just type in sum and difference trig identity and you should find what you are you looking for.
anonymous
  • anonymous
I know you plug in for this I am just not how?
anonymous
  • anonymous
so we use this form in cosucosv=1/2{cosu-v)+cos(u+v0} so now we plug in?
anonymous
  • anonymous
Cos u+Cos v =2Cos((u+v)/2)Cos((u-v)/2)
anonymous
  • anonymous
So now just make the appropriate substitutions for u and v.
anonymous
  • anonymous
when plugging in for U and v does the 1/2 mean a power?
anonymous
  • anonymous
No, it's multiplying the sum and difference of the two angles by 1/2.
anonymous
  • anonymous
cosucosv=1/2 cos 6x+cos2x=0
anonymous
  • anonymous
is this right so far?
anonymous
  • anonymous
Actually, it should be 2cos4xcos2x=0
anonymous
  • anonymous
okay that is what I need help with?
anonymous
  • anonymous
1/2 of 6 is only 3??
anonymous
  • anonymous
Sum of 6x and 2x is 8x divided by 2 is 4x. Difference of 6x and 2x is 4x divided by 2 is 2x.
anonymous
  • anonymous
You do not take halfe of each angle you take half of their sum and then half of their difference.
anonymous
  • anonymous
so you add 6+2= 8 and than divide the sums by 2?
anonymous
  • anonymous
Yes, and then you do it again only use their difference.

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