Question

REPOST (because the other one got too cluttered)
Find y if the point (15, y) is on the terminal side of θ and\[\cos\theta=\frac{15}{17}\](Enter your answers as a comma-separated list.)

My result was \[\pm8\]but I'm told that it's the wrong answer. ッ

what I did: \[y=\sqrt{17^{2}-15^{2}}=\sqrt{289-225}=\sqrt{64}=\pm8\]\[x=15,y=8,r=17\]\[\sin\theta=\frac{8}{17},\cos\theta=\frac{15}{17},\csc\theta=\frac{17}{8},\sec\theta=\frac{17}{15}\]I would have kept going but I'm not sure if I'm going in the right direction.

Answer 1

Please help, anyone? @DanJS @dan815 @ganeshie8 @Luigi0210

Answer 2

@undeadknight26 @radar @freckles @Zale101 I don't want to mass-tag but I really need help on this. e_e

Answer 3

Did I mess up anywhere?

Answer 4

\(\pm 8\) looks good to me

Answer 5

Indeed but I got the "wrong answer" according to the website. I am confused.
http://prntscr.com/8di5he

@ganeshie8 ?

Answer 6

try entering

-8,8

without spaces between them

Answer 7

I've done that on other problems with the same result as the original attempt...
I honestly don't think it's a typo issue.

Answer 8

But if you think there is no other way that it is wrong I will try it. ^^;
I wanted to try this but I wasn't sure if I'd done anything wrong; hence wasting an answer submission would not be ideal.

Answer 9

please take other opinions too

Answer 10

I trust your opinion though >_> yours and batman's. but he's offline

Answer 11

to me -8,8 looks is the correct answer
i don't see how it can possibly go wrong..

Answer 12

Okay I'll submit it then :]

Answer 13

Yes I got the same thing

Answer 14

-stares blankly-
OMFG. IT WAS THE REASON ALL ALONG

Answer 15

-slams face into desk- WHY IS THIS WEBSITE SO FREAKING STUPID.

Answer 16

But thanks for your time and help @ganeshie8 :)

Answer 17

dumb graders, congrats! :)

Answer 18

lol yes. thank you very much > _ <;;