Question

Help with sin, cos tan.

Answer 1

1/2 =sin 30

Answer 2

sin 45 =opp/hyp =1/sqrt (2)

Answer 3

http://www.mathsisfun.com/sine-cosine-tangent.html

Answer 4

go through above useful link @eoog .

Answer 5

Yep I've been on it :P, not really understanding you just divide everything?

Answer 6

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Answer 7

are u familiar with above link ? @eoog

Answer 8

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Answer 9

do u see a triangle over there ? @eoog

Answer 10

On that link? yes

Answer 11

If 1/2 =sin 30 does that make it 0.707?

Answer 12

ok

Answer 13

wait A sec !

Answer 14

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Answer 15

b familiar with opposites and other side .

Answer 16

So in my case the hypo is the line with 1 and sqrt 3 on it?

Answer 17

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Answer 18

wait forget about the problem for a while ,first familiarise with the concept.

Answer 19

is above 2 triangles link clear @eoog

Answer 20

All these are saying the hypo is the top line, is that true for every problem? the longest line on top?

Answer 21

hypo is always the longest side .

Answer 22

Okay then I know you said forget about the problem but in this case the longest line is the bottom line can that be the hypo?

Answer 23

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Answer 24

no here there are 2 triangles combined !

Answer 25

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Answer 26

Oh okay so the hypo is the line with the 2, now for the (0) is that always above the square?

Answer 27

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Answer 28

hypo is 2 and sqrt (2) in the triangle ! remember there are 2 hypo s here !

Answer 29

side opp to 90 degrees is ur hypo !

Answer 30

So which do I know what do first? It's 2,1 and sq2 1

Answer 31

wait a sec.

Answer 32

it depends on the angle given !

Answer 33

Oh! so since this gives us 30

Answer 34

say for 30 deg in right side triangle ! sin(30) =opp/hyp

Answer 35

Okay okay I'm starting to understand that now, now how do we move on to finding the conclusion 2 divided by 1?

Answer 36

opp side is the side opp to given angle

Answer 37

hypo is 2 opposite in 1 in this case right?

Answer 38

good

Answer 39

sin (30) = opp / hyp =1/2

Answer 40

now can u define sin (45) similarly @eoog ?

Answer 41

Yes I'll give it a shot, but to clarify 1/2 is the solution to sin 30? o.o

Answer 42

yes

Answer 43

OH before I do 45 for example sin (45) opp/hyp 1/ sq2, does the opp/hypo every switch places? for example hypo/opp

Answer 44

sin (45) use left side of the triangle

Answer 45

no

Answer 46

sin ( any angle ) =opp / hyp only !

Answer 47

so 45 would be 1/ sqrt2?

Answer 48

yes

Answer 49

cos (30) = ?

Answer 50

cos (any angle ) in terms of sides is what ratio @eoog ?

Answer 51

I'm confused? Isn't con adj/hypo??

Answer 52

yes

Answer 53

hypo is the longest side in any triangle and opp is found by side opp to given angle !

Answer 54

remaining is ur adj

Answer 55

cos = adj/hypo

Answer 56

so adj to 30 is sq3

Answer 57

yes

Answer 58

so sq3/2?

Answer 59

:)

Answer 60

now cos (60) u find similarly and this is the last one.

Answer 61

Oh (60) is in the other triangle?

Answer 62

cos (30) = (sqrt 3) /2 is right .

Answer 63

Wait no it's not, so I'm confused how we would do this

Answer 64

do it similarly

Answer 65

cos = adj/hypo

Answer 66

tell me adj in right side triangle

Answer 67

isn't it still sq3? we aren't using the other triangle right?

Answer 68

I'm confused on how it isn't the same answer as cos 30

Answer 69

c here there are 2 triangles combined ! don't get confused , concentrate on the angles

Answer 70

one triangle that is on left side has only 45 deg angle only one angle

Answer 71

one triangle that is on right side has 60 deg and 30 deg angle - two angles

Answer 72

60 deg angle lies to the left or right u tell me this @eoog

Answer 73

The top let, so does it go into the both triangles?

Answer 74

60 deg angle lies to the right isn't it ?

Answer 75

Well here's where I'm confused with 30 deg 60 is in the top left with 45 deg it's in the top right, can you use 60 for both triangles?

Answer 76

if that's the case then cos 60 is 1/sq2?

Answer 77

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Answer 78

Thank you for that, now this is the question I don't understand, you see how 60 is in abc can it also be in acd?

Answer 79

abc and acd are 2 triangles

Answer 80

60 is in acb only !

Answer 81

why r u confusing ur self unnecessarily how can 60 lie in acd ?

Answer 82

Well I don't know because if it doesn't then isn't cos (60) the same answer as cos (30)

Answer 83

60 degrees lies in acb triangle

Answer 84

cos (30) =adj/hyp = (sqrt 3)/2
cos (60) =adj/hyp = 1/2

Answer 85

30 degrees and 60 degrees both lie in triangle acb only .

Answer 86

Okay I understand that now but can you explain how you go 1/2? isn't one the opposite?

Answer 87

Do you flip the triangle? wouldn't it be the same?

Answer 88

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Answer 89

go through above link for cos (30)

Answer 90

Yep I understand that :) how to get the outcome of (60) I'm a little confused

Answer 91

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Answer 92

go through above link for cos (60)

Answer 93

Yes! you see I'm reading a link you sent me earlier and it says

Answer 94

adj is always next to the angle so I can see now how the adj moved to 1 instead of sq3

Answer 95

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Answer 96

no ! adj is not always next to the angle

Answer 97

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