Question

Please help
question in comments

Answer 1

THis diagram is a proof without words
These equations can be derived from the diagram then be used to solve law of cosines
\[(2a \cos x-b)b=(a-c)(a+c)\]

Answer 2

Sorry

Answer 3

I dont need help on the math only how you derive the equation from it

Answer 4

You're ahead of me. Matter-of-fact, do you think you can help me?

Answer 5

Sure, what can I do for ya?

Answer 6

What are the sine, cosine, and tangent of Θ = 7 pi over 4 radians?

Answer 7

Ive been stuck on that for like a week....

Answer 8

Well let's draw that, on a unit circle

Answer 9

How many radians are there in a full circle?

Answer 10

Hmm, 2?

Answer 11

Just 2?

Answer 12

Wair, i think theres six?

Answer 13

wait*

Answer 14

Mm try again, it kinda, 2 is the right number, what you're missing is the most circle related thing ever

Answer 15

Take out it kinda, don't know why i typed that

Answer 16

2pi

Answer 17

LOL

Answer 18

Yes

Answer 19

Okay

Answer 20

So if it is 7pi/4 radians it's asking for how much of 2 pi is that

Answer 21

Do I convert 7pi/4 into degrees, then work from there?

Answer 22

You don't have to, if you feel more comfortable with degrees, you could, but it's way easier with radians in my opinion

Answer 23

Okay, I'm just confused on what to do. Step by step, how would I determine?

Answer 24

This is the hardest lesson ever! :(

Answer 25

Ok, completely forget about the pi, just think of 2 as 1 time around the circle, how much around the circle is 7/4, then

Answer 26

It's fine you'll get it :) it was a bit confusing for me too

Answer 27

1 and 3/4

Answer 28

Basically what you're telling me is that it goes around 1 and 3/4 of the circle like this?

Answer 29

Do you understand why? because there is a total of 2?

Answer 30

So, if 2 is 360. Then 1 is 180, correct?

Then, if I simplify 7/4 it turns into 1 and 3/4.

Three fourths of a circle is 270 degrees.

Answer 31

1 and 3/4= x

1=180
3/4= 270

=450?

Answer 32

Umm no,... but hold on,
If you use 7/4, 1/4 is left right?, just follow

Answer 33

Let's add the pi back in

Answer 34

Thats the angle right?

Answer 35

Does 1/4 *pi or simpliefied, pi/4 ring a bell when you convert it to degrees?

Answer 36

Yes, I believe so.

Answer 37

Yes

Answer 38

So what is it in degrees?

Answer 39

1/4 in degrees?

Answer 40

well not 1/4, it's pi/4

Answer 41

Want me to tell you the answer?

Answer 42

I think it's like 14.3 ish?

Answer 43

Umm, no, it's 45 degrees

Answer 44

Do 45-45-90 triangles ring a bell?

Answer 45

Yes. Thats in the first part of my chapter

Answer 46

So do you know the patterns in a 45-45-90?

Answer 47

Just in case here is a refresher