Question

find the exact value of cos(135) and sin(135)

Answer 1

@Calcmathlete

Answer 2

@ahaines14 @seattle12345 @sami-21 @Callisto

Answer 3

@Calcmathlete

Answer 4

help!

Answer 5

calling all units we need help on math

Answer 6

hellp me

Answer 7

lol...it's called the unit circle.

Answer 8

wait

Answer 9

Do you remember the values for it?

Answer 10

how do we find out without using the unit circle?

Answer 11

Your back!

Answer 12

what's on my back?

Answer 13

Not really any other way at this point. A bit of advice, you probably should memorize the unit circle, or at least Quadrant I.

Answer 14

can you plz post it

Answer 15

Long link is long link XD
http://www.google.com/imgres?q=unit+circle&um=1&hl=en&sa=N&biw=1437&bih=695&tbm=isch&tbnid=zCoPII8QibzEpM:&imgrefurl=http://en.wikipedia.org/wiki/Unit_circle&docid=D09vYD7H2hKF-M&imgurl=http://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Unit_circle_angles_color.svg/300px-Unit_circle_angles_color.svg.png&w=300&h=300&ei=_u4VUK2HA4m88ATf6YCgAw&zoom=1&iact=hc&vpx=178&vpy=174&dur=831&hovh=225&hovw=225&tx=149&ty=73&sig=115231322510631708470&page=1&tbnh=143&tbnw=141&start=0&ndsp=21&ved=1t:429,r:0,s:0,i:141

Answer 16

Got it?

Answer 17

how do I figure it out with the unit circle?

Answer 18

cosine is the x-value and sine is the y-value.

Answer 19

Its 2 root 2, isnt it?

Answer 20

With a hypotenuse of 1

Answer 21

what does that mean calc?

Answer 22

\[\cos 135º = -\frac{\sqrt{2}}{2}\]\[\sin 135º = \frac{\sqrt{2}}{2}\]

Answer 23

Basically, the coordinates for 135º on the unit circle is \[(-\frac{\sqrt{2}}{2}, \frac{\sqrt{2}}{2})\]cosine is the x-value and sin is the y-value.

Answer 24

right, because it is in the second quadrant, and you have to go back.707, then up .707

Answer 25

Thats how I think of it

Answer 26

Yeah. Also, @Topkart33 usually when you use the unit circle, you don't use a calculator because that defeats the purpose of using it..

Answer 27

will it always be cos and sin only
what about tan?

Answer 28

Remember that \[\tan = \frac{\sin}{\cos}\]

Answer 29

Right, it just gives me a perspective of what the traingel looks like in relationship to where it is on the circle, I know it is root 2/2

Answer 30

triangle*

Answer 31

is there a numonis device to remember all the formulas?

Answer 32

For the sin, cos, and trig part?

Answer 33

*tan

Answer 34

no for sn=a1(n^r-1) etc.

Answer 35

calcmath what time is it in your place?

Answer 36

ok lets do it
\[\Large \cos(90+45)=-\sin(45)=-\frac{1}{\sqrt{2}}\]

Answer 37

Well, I don't have one for the sequences and series ones, but I never really needed it :/ It is 10:28

Answer 38

oh same here

Answer 39

now for sin
\[\Large \sin(90+45)=\cos(45)=\frac{1}{\sqrt{2}}\]

Answer 40

cos is x and is y, right?

Answer 41

@Anikate did you get it ?

Answer 42

and sin is y right?

Answer 43

10:28 PM?

Answer 44

Now 10:31pm, yeah that is the proof of it

Answer 45

@Anikate ??

Answer 46

cos is x and sin is y right?

Answer 47

someone answer me

Answer 48

Yes. cos is x and sin is y.

Answer 49

@Anikate what is the Question can you elaborate ? i did not get your question
you want to find the values of sin(135)
and cos(135)
correct?

Answer 50

Do you understand? You can also work it out if you want.