Question

Which of the equations (drawn inside!) are identities?

***CHOOSE ALL THAT APPLY!!!***

I don't get this one :( @terenzreignz :)

Answer 1

Well, which of these equations are ALWAYS true, no matter what value of x (in their domains, of course)

Answer 2

HINT: There are two of them...

Answer 3

ermm, i'm not too sure :( i think one of them is A right?

Answer 4

Yes, A is true... simply because
\[\huge \cot(x) = \frac1{\tan (x)}\]
And the other?

Answer 5

plus in values to check.

Answer 6

umm is it B? :)

Answer 7

No guessing.
A variation of what @primeralph said, see if there are any values of x, any at all, which would make the equation false.

Answer 8

cuz i'm pretty sure D isn't one right?

Answer 9

D isn't one, for sure.

Answer 10

so i'm debating between B and C... :/ lemme take a look again :)

Answer 11

you do that :)

Answer 12

okay... ermm quick question, i use a calc for this right? if so, how do you input csc again? ;/ i always forget.. is csc 1/sin ? :/

Answer 13

csc = 1/sin

Answer 14

pfff
why would you use 1/sin for csc
if you weren't ALREADY SURE that
\[\huge \csc(x) = \frac1{\sin(x)}\]
???
You just made me LOL

Answer 15

ohhh lol... so basically it's A and C then? :P

Answer 16

Yeah...
you had the answer already...

This is a keeper :D

Answer 17

By the way, @primeralph
Welcome to OpenStudy, I hope you're here to stay :D

Answer 18

lol.... omg *facepalm* hahahah :P

thanks :) A and C it is!! :)

Answer 19

*choose all. Answer may be more than one

Answer 20

yeah, welcome to OS!! :)

Answer 21

and yup @primeralph so we got A and C :)

Answer 22

thanks!!! :)