Question

http://prntscr.com/95wb7s

Answer 1

actually I need help on this one more http://prntscr.com/95wc8x
but if I get help on the first one I'm good, I think

Answer 2

45 = 30 + 15
15 = 30 - 15

Answer 3

Yes

Answer 4

o-0?

Answer 5

cos(45) + cos(15)
= cos(30+15) + cos(30-15)
= ?

Answer 6

Oh... but is the way I did it wrong?
(used the formula) http://prntscr.com/95wd5e

Answer 7

you should get :

2cos(30) * cos(15)

right ?

Answer 8

I did and the answer is marked wrong

Answer 9

because

(45+15)/2 = 60/2 = 30

(45-15)/2 = 30/2 = 15

Answer 10

i don't see how you can possibly get 22.5

Answer 11

answer is marked "wrong" because "missing degree symbol"

Answer 12

that may be another reason

Answer 13

oh? :o

Answer 14

22.5 looks wrong

Answer 15

?

Answer 16

work it again

Answer 17

I put the answer you got

Answer 18

it was wrong

Answer 19

what have you put ?

Answer 20

the answer you said

Answer 21

which one

Answer 22

http://prntscr.com/95wecc

Answer 23

It won't take anymore submissions but I wish to know what I did wrong
maybe it will help with the second question http://prntscr.com/95wc8x

Answer 24

i can help if you stop rushing

Answer 25

the statement in the question says "simpilify if possible"

Answer 26

2cos(30) * cos(15)


remember the value of cos(30) from unit circle ?

Answer 27

I'm not rushing. I'm saying that I don't have to get this question solved asap, since it won't take any more submitted answers.
The other question has submissions.

Answer 28

*still has submissions available, so it's of higher priority is all

Answer 29

but either or is fine

Answer 30

hmm

Answer 31

for the second one I got 2cos(pi/4)cos(pi/6) http://prntscr.com/95wffl also wrong ?!

Answer 32

This is a product what the heck -.-

Answer 33

@ganeshie8 it says missing DEGREES though, and unit circle trig function values don't contain degrees ??

Answer 34

As I said earlier, it seems you need to simplify the product

Answer 35

do you still think you're not rushing ?

Answer 36

But how would using unit circle values contain degrees?
And this is due in 7 minutes.

Answer 37

*lost*

Answer 38

how many more submissions do u have ?

Answer 39

*glitched and hit wrong button on other problem; ran out of submissions; wrong*

No idea, and based on previously mentioned occurrence ^ not willing to test that

Answer 40

At least 2 I'd wager

Answer 41

also did you realize, you're using the wrong formula. you need to use below circled one :