Question

is cosx=-1/√2 possible?

Answer 1

Why not?

Answer 2

It's true at 135 degrees

Answer 3

?? explain pls?

Answer 4

cos(135) = -1/√2

Answer 5

Or, simply, it is possible because 1/√2 is between -1 and 1

Answer 6

would it always be that way, cuz on the unit circle cos 135 is -√2/2 or am i lookin at this the wrong way?

Answer 7

Erm... -sqrt2/2 = -1/sqrt2.

Answer 8

oh ok, srry nvr took trig before.....very confusing.

Answer 9

thnx

Answer 10

No problem, it's not too confusing!

Answer 11

i rly don't understand the whole concept! seriously failing........

Answer 12

Do you understand why those two numbers are equal?

Answer 13

no not rly...

Answer 14

OK. So you know how in fractions you can multiply the same number in the numerator and the denominator and you still get an equal fraction?

Answer 15

yes.

Answer 16

well thnx anyway ^.^

Answer 17

Hey, I am not gonna leave you confused

Answer 18

So you have -1/sqrt2. Multiply both numerator and denominator by sqrt 2.

Answer 19

ok

Answer 20

You get -sqrt2/2 and tada!

Answer 21

oh cool XD

Answer 22

thnx