Question

Help with trig finding the exact value. Screenshot is attached

Answer 1

ok?

Answer 2

Okay

Answer 3

5 12 13 is a triangle you remember quite a bit so sin would equal 5/13

Answer 4

What's the expansion of \[\sin (\alpha+\beta)\]?

Answer 5

well once you get sin a and sin b you would use your identity

Answer 6

which is sinA cosB +cosA sin B

Answer 7

hey kva let him try!

Answer 8

oh snaps lol i thought you were him my bad lol

Answer 9

lol

Answer 10

@oroutdoors hey where are you?

Answer 11

lol

Answer 12

Sorry I stepped away for a minute! its sina cosb - cosa sinb??

Answer 13

correct

Answer 14

do you know how to get your sin a and sin b? or remember?

Answer 15

No thats where I keep messing up

Answer 16

alright well lets start with the easier one

Answer 17

so cos b is 5/6 correct?

Answer 18

correct

Answer 19

alright draw a triangle so you can find sin b

Answer 20

sin(a+b) is not equal to sinacosb - cosasinb!!

Answer 21

yeah it is

Answer 22

;-/ haha

Answer 23

its the identity

Answer 24

http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet_Reduced.pdf

Answer 25

go double check that if you dont believe me

Answer 26

look back your books!!

Answer 27

look at the formula

Answer 28

sin(a+b) = sinacosb+cosasinb
sin(a-b) = sinacosb-cosasinb

Answer 29

back to what i was saying

Answer 30

ok

Answer 31

so this will give you your sin a

Answer 32

ok

Answer 33

correct

Answer 34

Okay thats where I keep screwing up

Answer 35

\[\sin (\alpha+\beta)=\frac{ 25-12\sqrt{11} }{ 78}\]

Answer 36

Ya

Answer 37

So far haha

Answer 38

sin 5/13 cos 12/13?

Answer 39

I'm not getting it

Answer 40

I think i'm with you for the most part haha. Should I go ahead and plug those in?

Answer 41

Did you delete what you had?

Answer 42

figured you didnt need it lol

Answer 43

if you do i can retype it lol not gonna take too long to do so

Answer 44

No it's okay I just scrolled back down and wasn't sure

Answer 45

btw do you have the answer key?

Answer 46

No I don't

Answer 47

This is my last chance so I'm nervous to put in an answer ;-/

Answer 48

ahh got ya well lemme double check before you put it in

Answer 49

it would have to be that method for the first one second one it would be a different identity but same value and tan would be the same

Answer 50

but double check its the right formula

Answer 51

use this http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet_Reduced.pdf

Answer 52

Ok hold on

Answer 53

its on the right side sum difference formula

Answer 54

The method they want me to use in the example I get the answer 25/78-2root11/13

Answer 55

well go with what the example they use maybe i miscalculated not a computer after all lol

Answer 56

but i know i used the right formula for a fact

Answer 57

oh snaps lol i wrote the cosb wrong lol i used the reciprocal

Answer 58

gimme 1 sec and ill give you the proper values

Answer 59

Thanks for your help! @amilapsn had the right answer the program didn't like how I entered it of well lol

Answer 60

the values were (5/13)(5/6)+(12/13)(square root 11/6)

Answer 61

so it would have resulted in the same answer

Answer 62

Yes

Answer 63

accidentally flipped the 5/6 to 6/5

Answer 64

sorry for wasting your time i guess lol

Answer 65

No I appreciate your help! don't be sorry!

Answer 66

for part b -10/13-5root11/78?

Answer 67

is that what you get @amilapsn