anonymous
  • anonymous
If sin theta=3/5 and theta is in quad 2 the exact form of cos (5pi/3-theta) is .....? I just need help with it I can do the work but a little help could help lol
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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0_0youscareme
  • 0_0youscareme
https://answers.yahoo.com/question/index?qid=20100719180410AAc49St
anonymous
  • anonymous
o.O thats not the same question
anonymous
  • anonymous
Yeah I know for sure thats not the right answer lol

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anonymous
  • anonymous
Use the compound angle formula for cos,
0_0youscareme
  • 0_0youscareme
i put the link there bcuz that he just put copy and paste
anonymous
  • anonymous
this thing is refusing to let me use the equation tool... cos(A-B)=cosAcosB+sinAsinB
0_0youscareme
  • 0_0youscareme
i never said it had the answer
anonymous
  • anonymous
Nono lol I was talking about jacob
0_0youscareme
  • 0_0youscareme
yeah but i put the link were he copy and pasted the answer some1 else put
anonymous
  • anonymous
I got the answer 3sqrt3-4/10 but thats the same answer as another problem I did
anonymous
  • anonymous
he deleted it i think... XD
anonymous
  • anonymous
\[\sin \Theta=\frac{ 5 }{ 3 }\] \[\cos \theta=\frac{ 4 }{ 5 }\] \[\cos (\frac{ 5\pi }{ 3 }-\theta)=\cos \frac{ 5\pi }{ 3 } \cos \theta + \sin\]
anonymous
  • anonymous
oops incomplete... k im not used to this equation tool. meant to be sin5pi/3sin(theta)
anonymous
  • anonymous
@zepdrix Do you have any idea of how this is done? I think my work is correct
anonymous
  • anonymous
\[=\frac{ 1 }{ 2 }\frac{ 4 }{ 5 }+(-\frac{ \sqrt{3} }{ 4 })\frac{ 3 }{ 5 }\]
anonymous
  • anonymous
I think I got it now after doing it
anonymous
  • anonymous
But the way you were doing it was a little wrong lol

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