anonymous
  • anonymous
I need help I will download question
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
@mayankdevnani
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
@badreferences

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anonymous
  • anonymous
Do you know the trigonometric identities? Sin and cosine?
anonymous
  • anonymous
cosine =adjustment/hypotenuse right
anonymous
  • anonymous
|dw:1349573615545:dw|
anonymous
  • anonymous
cos 50=x/90
anonymous
  • anonymous
Not so fast. So we know that \(a=50\) degrees. \(\cos a=\frac BC\). \(C\) we know is \(90\). So yes, to solve for B, you would use \(B=90\cos a\).
anonymous
  • anonymous
cost 50=confused
anonymous
  • anonymous
cos 50=x/90
anonymous
  • anonymous
Yes. Multiply both sides by \(90\).
anonymous
  • anonymous
you multiply 50x90 right
anonymous
  • anonymous
No, you multiply 90 by cos 50.
anonymous
  • anonymous
50x90=4,500
anonymous
  • anonymous
i got 4,500
anonymous
  • anonymous
\[90\cdot\cos50\neq90\cdot50\]
anonymous
  • anonymous
i got 86.87
anonymous
  • anonymous
That sounds off.
anonymous
  • anonymous
im not sure
anonymous
  • anonymous
Do you know how to do \(90\times\cos50\)?
anonymous
  • anonymous
cosx50 right
anonymous
  • anonymous
No, \(\cos\) is an operation.
anonymous
  • anonymous
im getting 4,500 for some reason
anonymous
  • anonymous
Alright, do you know what an operation is? \(\sin x\) and \(\cos x\) are like machines into which you put a number \(x\) and retrieve a value. So do \(\cos50\) first.
anonymous
  • anonymous
im getting 50
anonymous
  • anonymous
i did cos 50
anonymous
  • anonymous
if i do 50 cos=0.9649
anonymous
  • anonymous
\(50\cos\neq\cos50\).
anonymous
  • anonymous
It's not a multiplication.
anonymous
  • anonymous
im getting 50
anonymous
  • anonymous
i click on cos and than i put 50 so i got 50
anonymous
  • anonymous
I have no idea what you're talking about. You sound confused. Do you know what \(\sin x\) is?
anonymous
  • anonymous
yes on calculator
anonymous
  • anonymous
No, even more importantly, \(\sin x\) is an operation performed on \(x\). You're used to operations like \(+,-,\times,\div\), but \(\sin x\) is an operation like that. You can't just move the \(\sin\) around.
anonymous
  • anonymous
@swissgirl @bahrom7893 I can't tell what the confusion here is. Help me!
anonymous
  • anonymous
@nincompoop You are a better teacher.
swissgirl
  • swissgirl
Ok well on your calculator you should have this button called sin, cos and tan correct?
anonymous
  • anonymous
yes
swissgirl
  • swissgirl
allrrighhttyy so on your calculator type 90*Cos(50) then press enter
swissgirl
  • swissgirl
ohhhh u r on radians. You gotta set your calculator to degrees
anonymous
  • anonymous
oh that's the problem
anonymous
  • anonymous
i dont know why im getting 4,500
anonymous
  • anonymous
what i did is 90xcos50
anonymous
  • anonymous
you don't multiply when its cos(50) right
swissgirl
  • swissgirl
90*50=4500 But we are typing 90*Cos(50) remember to include the Cos
anonymous
  • anonymous
ok i was using my iphone calculator that's why it wasnt working now im using internet cal and i got57.85
swissgirl
  • swissgirl
Correct:)
anonymous
  • anonymous
so what's next
swissgirl
  • swissgirl
idk ask bad
anonymous
  • anonymous
Ask @nincompoop ... I have a terrible headache.
anonymous
  • anonymous
The cosine of a 50° angle is ____
anonymous
  • anonymous
@lgbasallote YOU.
anonymous
  • anonymous
The second most powerful. Most powerful is undoubtedly CleverBot. :P
anonymous
  • anonymous
Unfortunately, CleverBot is not programmed to give you right answers. Just data mine a lot.
anonymous
  • anonymous
ok who i should ask for help
anonymous
  • anonymous
Ugh, I don't know how to help because it seems you aren't clear about what you're confused on.
anonymous
  • anonymous
ok
anonymous
  • anonymous
i wasnt using the right calculator
anonymous
  • anonymous
now i got it

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