anonymous
  • anonymous
if sin a 15/17 what is cos a
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Luigi0210
  • Luigi0210
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anonymous
  • anonymous
Thank you
Luigi0210
  • Luigi0210
And as for your question, let's start of by drawing a triangle and labeling it

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anonymous
  • anonymous
Ok
anonymous
  • anonymous
anonymous
  • anonymous
This is what I have
Luigi0210
  • Luigi0210
Do you know what sin is? In terms of sides and such?
anonymous
  • anonymous
No not in the terms of a triangle
Luigi0210
  • Luigi0210
\[\sin \theta = \frac{opposite}{hyp}\]
anonymous
  • anonymous
okay
Luigi0210
  • Luigi0210
|dw:1377756716504:dw|
anonymous
  • anonymous
ok so the sin 0 represents the angle that
anonymous
  • anonymous
we need to solve for.
Luigi0210
  • Luigi0210
Actually no, we just need to solve for a side. The problem gives us this: |dw:1377756852146:dw| And we need cos which is: \[\cos \theta = \frac{adj}{hyp}\]
Luigi0210
  • Luigi0210
So solve for this side using the Pyth. theorem: |dw:1377756964414:dw|
Luigi0210
  • Luigi0210
\[a^2+b^2=c^2\]
anonymous
  • anonymous
Okay
anonymous
  • anonymous
so it would be 15^2+b^2=17^2?
Luigi0210
  • Luigi0210
Yup, now just solve for that b
anonymous
  • anonymous
Okay, i have for 15^2=225 and for 17^2=289. Now i subtract them to get b^2?
Luigi0210
  • Luigi0210
Mhm
anonymous
  • anonymous
My answer was 64, is that the last step?
Luigi0210
  • Luigi0210
Now take the square root
anonymous
  • anonymous
ok I have 8.
anonymous
  • anonymous
thats the last step?
Luigi0210
  • Luigi0210
The last step is finding cosine, so now we have a complete triangle: |dw:1377757518428:dw| Just find what \[\cos \theta =\] And you're done :)
anonymous
  • anonymous
Ok, how do you find the cos? I thought that was what you where explaining :)
Luigi0210
  • Luigi0210
\[\cos \theta = \frac{adj}{hyp}\] Just plug in the values
anonymous
  • anonymous
oh ok i was confused. sorry.
anonymous
  • anonymous
Thank you :D
Luigi0210
  • Luigi0210
Anytime, good job btw
anonymous
  • anonymous
Thank you for the medal.
Luigi0210
  • Luigi0210
Just a heads up, you can give medals to users if they have helped you. And also if you have any more questions on the site feel free to PM me or any other Ambie with an "A" next to their name. Enjoy the site :)
Luigi0210
  • Luigi0210
And no prob, thanks for following along.. most users on here just want answers.
Luigi0210
  • Luigi0210
And those are the users that people tend to ignore on here
anonymous
  • anonymous
Ha thats bad
anonymous
  • anonymous
I want to understand not just get an answer..
anonymous
  • anonymous
I have one question for you
anonymous
  • anonymous
Is the formula for tan the same as cos?
Luigi0210
  • Luigi0210
Good, if you try and listen then users will be happy to assist you later on. And no, this is tan: \[\tan \theta = \frac{opposite}{adj}\]
anonymous
  • anonymous
Ok cool, I wont have math for a while but I will defiantly pass this site on. This is better than what i am getting at my school :(
Luigi0210
  • Luigi0210
Alright, awesome :) And yea, most users also have the same complaint about schools/teachers not being good :P
anonymous
  • anonymous
lol I am sure
Luigi0210
  • Luigi0210
Alright, take care!
anonymous
  • anonymous
Thank you again, you too

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