Question

Which of the following equations are identities? Check all that apply.

Please explain. Thank you!

Answer 1

did you take notes ??

Answer 2

do you know sin = ??
abd cos = ?

Answer 3

and*

Answer 4

identities are those equations which are true for all x .

Answer 5

Are those considered reciprocal identities?

Answer 6

yes all equations which are true for all x are considered

Answer 7

u know abt sin and cos ,cot and tan functions

Answer 8

http://www.themathpage.com/atrig/trigonometric-identities.htm it looks like C. cot x=cos x/sin x and D. tan x=1/cot x are on there.

Answer 9

yes u are right and what is a option.

Answer 10

but the x is replaced with a theta sign on there?

Answer 11

x can be anything it can be theta beta alha gamma phi anything ,u can think of

Answer 12

Oh ok so c. and d. would be the answer then right?

Answer 13

yes and also a if option a is cosx=1/secx

Answer 14

Even A. also? What is a option im not sure what that means?

Answer 15

what is option a in the question

Answer 16

oh ok sorry I miss understood option A. is csc x=1/sec x

Answer 17

what is csc ?

Answer 18

Cosecant

Answer 19

easy way to memorize it
you should have one "c"
for example if you have sin it should be equal to something which have "c"
for cos
cos already have c so it should be equal t o sec
i guess its make sense :P